二氯化二乙基丙二酰

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 1.97 g (0.0100 mol) of 3,4-dimethoxybenzohydroxamic acid, mp 170-173° C. (dec.) (lit, mp 167-168° C., F. Aljundi, E. Hannig, and K. Bohm, Pharmazie, 28, 362 (1973)), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 1.977 g (0.0100 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period with stirring. The reaction mixture was stirred for 1 hour at room temperature after which time all the hydroxamic acid has dissolved. The solution was extracted three times with 50 ml portions of water, four times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 2.36 g (73.5%) of crude 2-(3,4-dimethoxybenzoyl)-4,4-diethylisoxazolidine-3,5dione as a solid residue. Recrystallization of the solid from absolute ethanol gave pure 2-(3,4-dimethoxybenzoyl)-4,4-diethylisoxazolidine-3 5dione as a white solid: mp 108-109° C. IR (Nujol) 1805 (s, C=0), 1752 (s, C=0), 1693 cm-1 (s, C=0); 1H NMR (400 MHz, CDCl3) δ7.40-7.54 (m, 2H), 6.94-6.96 (d, 1H), 3.98 (s, 3H), 3.94 (s, 3H), 1.97 (q, 4H), 1.02 (t, 6H); High resolution MS, calc'd for: C16H19NO6 : 321.1212. Found: 321.1208. Anal. Calc'd for: C16H19NO6 : C, 59.80; H, 5.96; N, 4.36. Found: C, 60.04; H, 6.05; N, 4.44. was prepared in a 250 ml round bottom flask The mixture was cooled in an ice bath has dissolved The solution was extracted three times with 50 ml portions of water, four times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 2.70 g (0.0157 mol) of 4-chlorobenzohydroxamic acid, mp 170-171° C. (dec). (lit. mp 168° C. dec., Bielstein Handbook of Organic Chemistry, series H, vol 9. p. 341), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 3.097 g (0.0157 mol) of diethylmalonyl chloride was added dropwise over a 15 minutes period with stirring. The reaction mixture was stirred for 4 hours at room temperature after which time all the hydroxamic acid had dissolved. The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions for 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 0.76 g (16.4%) of crude 2-(4-chlorobenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue. Recrystallization of the solid from methanol gave pure 2-(4-chlorobenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a white solid: mp 98-100° C.; IR (Nujol) 1812 (s, C=0) 1745 (s C=0) 1700 cm-1 (s, C=0); 1H NMR (400 MHz, CDCl3) 7.77-7.80 (m, 2H), 7.49-7.52 (m, 2H), 1.99 (q/ 4H), 1.04 (t, 6H); High resolution MS, calc'd for: C14H14NO4 -Cl: 295.0612. Found: 295.0615. Anal. Calc'd for: C14H14NO4Cl: C, 56.86; H, 4.77; N, 4.74; Cl, 11.99. Found: C, 57.04; H, 4.63; N, 4.58; Cl, 11.88. The mixture was cooled in an ice bath had dissolved The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions for 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 1.51 g (0.0100 mol) of 4-methylbenzohydroxamic acid, mp 148-150° C. (dec.) (lit. mp 148° C. dec. , Beilstein Handbook of Organic Chemistry, series H, vol 9, p. 491), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 1.977 g (0.0100 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period with stirring. The reaction mixture was stirred for 2 hours at room temperature after which time all the hydroxamic acid had dissolved. The solution was extracted two times with 50 mL portions of water, three times with 50 mL portions of 5% hydrochloric acid, and two times with 50 mL portions of 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 0.94 g (34.2%) of crude 2-(4-methylbenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue. Recrystallization of the solid from methanol gave pure 2-(4-methylbenzoly)-4,4-diethylisoxazolidine-3,5-dione as a white solid: mp 92-93° C.; IR (Nujol) 1805 (s,C=0), 1747 (s, C=0) 1695 cm-1 (s, C=0);H1NMR (400 MHz, CDCl3) δ7.70 (d,2H), 7.29 (d,2H), 2.43 (s,3H), 1.95 (q. 4H), 1.00 (t, 6H); High resolution MS, calc'd for: C15H17NO4 : 275.1157. Found: 275.1163. Anal. Calc'd for: C15H17NO4 : C, 65.44; H, 6.23; N 5 09. Found: C, 65.24; H, 6.45; N, 5.28. was prepared in a 250 ml round bottom flask The mixture was cooled in an ice bath had dissolved The solution was extracted two times with 50 mL portions of water, three times with 50 mL portions of 5% hydrochloric acid, and two times with 50 mL portions of 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 1.67 g (0.0107 mol) of 4-methoxybenzohydroxamic acid, mp 158-159° C (dec.)(lit. mp 156-157° C. (dec.), Beilstein Handbook of Organic Chemistry, series H, vol 10, p. 170), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 2.107 g (0.0107 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period with stirring. The reaction mixture was stirred for 2 hours at room temperature after which time all the hydroxamic acid had dissolved. The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 2.19 g (70.4%) of crude 2-(4-methoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue Recrystallization of the solid from absolute ethanol gave pure 2-(4-methoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a white solid: mp 116-118° C.; IR (Nujol) 1810 (s,C=0), 1750 (s, C=0), 1690 cm-1 (s, C=0); 1H NMR (400 MHz, CDCl3) 7.83 (d, 2H), 6.98 (d, 2H), 3.89 (t, 3H), 1.95 (q, 4H), 1.01 (t, 6H); High resolution MS, calc'd for: C15H17NO5 : 291.1102. Found: 291.1106. Anal Calc'd for: C15H17NO5C, 61.84; H, 5.88; N, 4.81. Found: C, 61.83; H, 5.76; N, 4.76. was prepared in a 250 ml round bottom flask The mixture was cooled in an ice bath had dissolved The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure to give 2.19 g (70.4%) of crude 2-(4-methoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue Recrystallization of the solid from absolute ethanol

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 1.37 g (0.0100 mol) of benzohydroxamic acid, 10 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round-bottom flask. The mixture was cooled in an ice bath and 2.00 g (0.101 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period. The reaction mixture was stirred for one hour at room temperature after which time all the benzohydroxamic acid had dissolved. The solution was evaporated under reduced pressure, and to the residue was added 100 ml of cold water. The insoluble viscous oil was rubbed with a glass rod to effect solidification. The solid was filtered and dried to give 1.89 g (75.9%) of crude 2-benzoyl-4,4-diethylisoxazolidine-3,5-dione: mp 76-79° C. Recrystallization of 1.72 g of crude isoxazolidine-3,5-dione from 20 ml of absolute ethanol gave 1.56 g of pure 2-benzoyl-4,4-diethylisoxazolidine-3,5-dione: mp 87-88° C. (lit 87-88° C.) G. Zinner and R. Moll, Arch. Pharm., 299. (6), 562-8(1966), CA 65 10575f; IR (Nujol) 1817 (s, C=0), 1762 (s, C=0), 1714 (s, C=0) and 694 (s, aromatic C-H bend) cm-1 ; NMR (acetone-d6) δ 7.46 (m, 5, aromatic C--H), 1.87 (q, 4, CH2), 1.00 (t, 6, CH3). was prepared in a 250 ml round-bottom flask The mixture was cooled in an ice bath had dissolved The solution was evaporated under reduced pressure to the residue was added 100 ml of cold water The solid was filtered dried

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 2.27 g (0.0100 mol) of 3,4,5-trimethoxybenzohydroxamic acid (recrystallized from absolute ethanol prior to the reaction), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round-bottom flask. The mixture was cooled in an ice bath, and 2.00 g (0.0101 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period. The reaction mixture was stirred for one hour at room temperature after which time all of the hydroxamic acid had dissolved. The solution was extracted three times with 50 ml portions of water, four times 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate. The methylene chloride solution was dried (MgSO4) and evaporated to dryness under reduced pressure to give 2.86g (81.5%) of crude 2-(3,4,5-trimethoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione; as a solid residue: mp 103-106° C. Recrystallization of 2.72 g of the crude product from 20 ml of absolute ethanol gave 2.14 g of 2-(3,4,5-trimethoxybenzoyl)-4,4-diethylisoxazolidine-3,5mp 107- 109.5° C. recrystallized from absolute ethanol to the reaction), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round-bottom flask The mixture was cooled in an ice bath had dissolved The solution was extracted three times with 50 ml portions of water, four times 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate The methylene chloride solution was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 1.97 g (0.0100 mol) of 3,4-dimethoxybenzohydroxamic acid, mp 170-173° C. (dec.) (lit, mp 167-168° C., F. Aljundi, E. Hannig, and K. Bohm, Pharmazie, 28, 362 (1973)), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 1.977 g (0.0100 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period with stirring. The reaction mixture was stirred for 1 hour at room temperature after which time all the hydroxamic acid has dissolved. The solution was extracted three times with 50 ml portions of water, four times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 2.36 g (73.5%) of crude 2-(3,4-dimethoxybenzoyl)-4,4-diethylisoxazolidine-3,5dione as a solid residue. Recrystallization of the solid from absolute ethanol gave pure 2-(3,4-dimethoxybenzoyl)-4,4-diethylisoxazolidine-3 5dione as a white solid: mp 108-109° C. IR (Nujol) 1805 (s, C=0), 1752 (s, C=0), 1693 cm-1 (s, C=0); 1H NMR (400 MHz, CDCl3) δ7.40-7.54 (m, 2H), 6.94-6.96 (d, 1H), 3.98 (s, 3H), 3.94 (s, 3H), 1.97 (q, 4H), 1.02 (t, 6H); High resolution MS, calc'd for: C16H19NO6 : 321.1212. Found: 321.1208. Anal. Calc'd for: C16H19NO6 : C, 59.80; H, 5.96; N, 4.36. Found: C, 60.04; H, 6.05; N, 4.44. was prepared in a 250 ml round bottom flask The mixture was cooled in an ice bath has dissolved The solution was extracted three times with 50 ml portions of water, four times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 1.97 g (0.0100 mol) of 3,4-dimethoxybenzohydroxamic acid, mp 170-173° C. (dec.) (lit, mp 167-168° C., F. Aljundi, E. Hannig, and K. Bohm, Pharmazie, 28, 362 (1973)), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 1.977 g (0.0100 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period with stirring. The reaction mixture was stirred for 1 hour at room temperature after which time all the hydroxamic acid has dissolved. The solution was extracted three times with 50 ml portions of water, four times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 2.36 g (73.5%) of crude 2-(3,4-dimethoxybenzoyl)-4,4-diethylisoxazolidine-3,5dione as a solid residue. Recrystallization of the solid from absolute ethanol gave pure 2-(3,4-dimethoxybenzoyl)-4,4-diethylisoxazolidine-3 5dione as a white solid: mp 108-109° C. IR (Nujol) 1805 (s, C=0), 1752 (s, C=0), 1693 cm-1 (s, C=0); 1H NMR (400 MHz, CDCl3) δ7.40-7.54 (m, 2H), 6.94-6.96 (d, 1H), 3.98 (s, 3H), 3.94 (s, 3H), 1.97 (q, 4H), 1.02 (t, 6H); High resolution MS, calc'd for: C16H19NO6 : 321.1212. Found: 321.1208. Anal. Calc'd for: C16H19NO6 : C, 59.80; H, 5.96; N, 4.36. Found: C, 60.04; H, 6.05; N, 4.44. was prepared in a 250 ml round bottom flask The mixture was cooled in an ice bath has dissolved The solution was extracted three times with 50 ml portions of water, four times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 2.70 g (0.0157 mol) of 4-chlorobenzohydroxamic acid, mp 170-171° C. (dec). (lit. mp 168° C. dec., Bielstein Handbook of Organic Chemistry, series H, vol 9. p. 341), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 3.097 g (0.0157 mol) of diethylmalonyl chloride was added dropwise over a 15 minutes period with stirring. The reaction mixture was stirred for 4 hours at room temperature after which time all the hydroxamic acid had dissolved. The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions for 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 0.76 g (16.4%) of crude 2-(4-chlorobenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue. Recrystallization of the solid from methanol gave pure 2-(4-chlorobenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a white solid: mp 98-100° C.; IR (Nujol) 1812 (s, C=0) 1745 (s C=0) 1700 cm-1 (s, C=0); 1H NMR (400 MHz, CDCl3) 7.77-7.80 (m, 2H), 7.49-7.52 (m, 2H), 1.99 (q/ 4H), 1.04 (t, 6H); High resolution MS, calc'd for: C14H14NO4 -Cl: 295.0612. Found: 295.0615. Anal. Calc'd for: C14H14NO4Cl: C, 56.86; H, 4.77; N, 4.74; Cl, 11.99. Found: C, 57.04; H, 4.63; N, 4.58; Cl, 11.88. The mixture was cooled in an ice bath had dissolved The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions for 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 2.70 g (0.0157 mol) of 4-chlorobenzohydroxamic acid, mp 170-171° C. (dec). (lit. mp 168° C. dec., Bielstein Handbook of Organic Chemistry, series H, vol 9. p. 341), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 3.097 g (0.0157 mol) of diethylmalonyl chloride was added dropwise over a 15 minutes period with stirring. The reaction mixture was stirred for 4 hours at room temperature after which time all the hydroxamic acid had dissolved. The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions for 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 0.76 g (16.4%) of crude 2-(4-chlorobenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue. Recrystallization of the solid from methanol gave pure 2-(4-chlorobenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a white solid: mp 98-100° C.; IR (Nujol) 1812 (s, C=0) 1745 (s C=0) 1700 cm-1 (s, C=0); 1H NMR (400 MHz, CDCl3) 7.77-7.80 (m, 2H), 7.49-7.52 (m, 2H), 1.99 (q/ 4H), 1.04 (t, 6H); High resolution MS, calc'd for: C14H14NO4 -Cl: 295.0612. Found: 295.0615. Anal. Calc'd for: C14H14NO4Cl: C, 56.86; H, 4.77; N, 4.74; Cl, 11.99. Found: C, 57.04; H, 4.63; N, 4.58; Cl, 11.88. The mixture was cooled in an ice bath had dissolved The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions for 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 1.51 g (0.0100 mol) of 4-methylbenzohydroxamic acid, mp 148-150° C. (dec.) (lit. mp 148° C. dec. , Beilstein Handbook of Organic Chemistry, series H, vol 9, p. 491), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 1.977 g (0.0100 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period with stirring. The reaction mixture was stirred for 2 hours at room temperature after which time all the hydroxamic acid had dissolved. The solution was extracted two times with 50 mL portions of water, three times with 50 mL portions of 5% hydrochloric acid, and two times with 50 mL portions of 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 0.94 g (34.2%) of crude 2-(4-methylbenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue. Recrystallization of the solid from methanol gave pure 2-(4-methylbenzoly)-4,4-diethylisoxazolidine-3,5-dione as a white solid: mp 92-93° C.; IR (Nujol) 1805 (s,C=0), 1747 (s, C=0) 1695 cm-1 (s, C=0);H1NMR (400 MHz, CDCl3) δ7.70 (d,2H), 7.29 (d,2H), 2.43 (s,3H), 1.95 (q. 4H), 1.00 (t, 6H); High resolution MS, calc'd for: C15H17NO4 : 275.1157. Found: 275.1163. Anal. Calc'd for: C15H17NO4 : C, 65.44; H, 6.23; N 5 09. Found: C, 65.24; H, 6.45; N, 5.28. was prepared in a 250 ml round bottom flask The mixture was cooled in an ice bath had dissolved The solution was extracted two times with 50 mL portions of water, three times with 50 mL portions of 5% hydrochloric acid, and two times with 50 mL portions of 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture consisting of 1.67 g (0.0107 mol) of 4-methoxybenzohydroxamic acid, mp 158-159° C (dec.)(lit. mp 156-157° C. (dec.), Beilstein Handbook of Organic Chemistry, series H, vol 10, p. 170), 5 ml of pyridine, and 100 ml of methylene chloride was prepared in a 250 ml round bottom flask. The mixture was cooled in an ice bath, and 2.107 g (0.0107 mol) of diethylmalonyl chloride was added dropwise over a 15 minute period with stirring. The reaction mixture was stirred for 2 hours at room temperature after which time all the hydroxamic acid had dissolved. The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate. The methylene chloride was dried (MgSO4) and evaporated to dryness under reduced pressure to give 2.19 g (70.4%) of crude 2-(4-methoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue Recrystallization of the solid from absolute ethanol gave pure 2-(4-methoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a white solid: mp 116-118° C.; IR (Nujol) 1810 (s,C=0), 1750 (s, C=0), 1690 cm-1 (s, C=0); 1H NMR (400 MHz, CDCl3) 7.83 (d, 2H), 6.98 (d, 2H), 3.89 (t, 3H), 1.95 (q, 4H), 1.01 (t, 6H); High resolution MS, calc'd for: C15H17NO5 : 291.1102. Found: 291.1106. Anal Calc'd for: C15H17NO5C, 61.84; H, 5.88; N, 4.81. Found: C, 61.83; H, 5.76; N, 4.76. was prepared in a 250 ml round bottom flask The mixture was cooled in an ice bath had dissolved The solution was extracted two times with 50 ml portions of water, three times with 50 ml portions of 5% hydrochloric acid, and two times with 50 ml portions of 5% sodium carbonate The methylene chloride was dried (MgSO4) evaporated to dryness under reduced pressure to give 2.19 g (70.4%) of crude 2-(4-methoxybenzoyl)-4,4-diethylisoxazolidine-3,5-dione as a solid residue Recrystallization of the solid from absolute ethanol