METHYL 2-(PHENYLMETHOXY)-BENZENEACETATE

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: The crude methyl 2-(2'-benzyloxyphenyl)-3-hydroxyacrylate was dissolved in dry DMF (100 ml) and potassium carbonate (29.0 g) was added in one portion. Dimethyl sulphate (16.00 g) in dry DMF (10 ml) was then added dropwise with stirring. After ninety minutes, water (300 ml) was added and the solution was extracted with ether (2×300 ml). After washing with water (3×150 ml) and brine, the extracts were dried and concentrated under reduced pressure, and the resulting yellow oil solidified on trituration with ether/petrol. Recrystallization from dry methanol afforded (E)-methyl 2-(2'-benzyloxyphenyl)-3-methoxyacrylate as a white, crystalline solid (5.44 g, 17% yield from methyl 2-benzyloxyphenylacetate), mp. 76°-77° C.; infrared max. (nujol mull): 1710, 1640 cm-1 ; 1H nmr (90 MHz): delta 3.63 (3H,s), 3.75 (3H,s), 5.05 (2H,s), 6.80-7.40 (9H,m), 7.50 (1H,s)ppm. After ninety minutes the solution was extracted with ether (2×300 ml) After washing with water (3×150 ml) and brine the extracts were dried concentrated under reduced pressure Recrystallization from dry methanol

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture of methyl 2-benzyloxyphenylacetate (26.99 g) and methyl formate (126.62 g) in dry DMF (300 ml) was added dropwise to a stirred suspension of sodium hydride (50% disp. in oil, 10.13 g) in DMF (300 ml) at 0° C. After stirring at 0° C. for two hours the mixture was poured into water (1000 ml) and washed with ether (2×150 ml). The aqueous layer was acidified to pH4 with 6M hydrochloric acid then extracted with ether (2×350 ml). The extracts were dried and concentrated under reduced pressure to afford crude methyl 2-[2'-benzyloxyphenyl]-3-hydroxyacrylate as a yellow oil, infrared max. (film): 1720, 1660 cm-1. washed with ether (2×150 ml) then extracted with ether (2×350 ml) The extracts were dried concentrated under reduced pressure

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

实验步骤: Methyl (2-hydroxyphenyl)acetate (21.0 g) was dissolved in DMF (200 ml), and potassium carbonate (19.35 g) was added in one portion. Benzyl bromide (23.94 g) in DMF (50 ml) was added dropwise to this mixture, with stirring, at room temperature. After eighteen hours the mixture was poured into water (500 ml) and extracted with ether (2×400 ml). The extracts were washed with water (3×150 ml) and brine (100 ml), dried and filtered through silica gel (50 g; Merck 60), then concentrated under reduced pressure to afford a yellow oil. Distillation at 160° C. and 0.05 mmHg afforded methyl 2-benzyloxyphenylacetate as a clear, colourless oil (26.99 g; 83% yield), infrared max. (film): 1730 cm-1 ; 1H nmr (90 MHz): delta 3.60 (3H,s), 3.75 (2H,s), 4.10 (2H,s), 6.80-7.40 (9H,m) ppm. extracted with ether (2×400 ml) The extracts were washed with water (3×150 ml) and brine (100 ml) dried filtered through silica gel (50 g; Merck 60) concentrated under reduced pressure to afford a yellow oil Distillation at 160° C.

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

实验步骤: 15 g of methyl 2-hydroxyphenylacetate are refluxed with 11.4 g of benzyl chloride and 6.2 g of potassium carbonate in 90 ml of absolute methanol for 24 hours. The mixture is filtered, the filtrate is evaporated down, 400 ml of ether are added to the residue, and the solution is washed with water, dried with MgSO4 and evaporated down. Distillation of the residue at about 200° C. and under 18 mbar gives 15.5 g of pale oil. The mixture is filtered the filtrate is evaporated down 400 ml of ether are added to the residue the solution is washed with water dried with MgSO4 evaporated down Distillation of the residue at about 200° C.

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

实验步骤: 15 g of methyl 2-hydroxyphenylacetate are refluxed with 11.4 g of benzyl chloride and 6.2 g of potassium carbonate in 90 ml of absolute methanol for 24 hours. The mixture is filtered, the filtrate is evaporated down, 400 ml of ether are added to the residue, and the solution is washed with water, dried with MgSO4 and evaporated down. Distillation of the residue at about 200° C. and under 18 mbar gives 15.5 g of pale oil. The mixture is filtered the filtrate is evaporated down 400 ml of ether are added to the residue the solution is washed with water dried with MgSO4 evaporated down Distillation of the residue at about 200° C.

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

实验步骤: The crude methyl 3-hydroxy-2-(2'-benzyloxyphenyl)propenoate was dissolved in dry DMF (100 ml) and potassium carbonate (29.0 g) was added in one portion. Dimethyl sulphate (16.00 g) in dry DMF (10 ml) was then added dropwise with stirring. After ninety minutes, water (300 ml) was added and the solution was extracted with ether (2 x 300 ml). After washing with water (3 x 150 ml) and brine, the extracts were dried and concentrated under reduced pressure, and the resulting yellow oil solidified on trituration with ether/petrol. Recrystallization from dry methanol afforded E-methyl 3-methoxy-2-(2'-benzyloxyphenyl)propenoate as a white, crystalline solid (5.44g, 17% yield from methyl 2-benzyloxyphenylacetate), M.P. 76-77° C.; infrared maxima (nujol mull): 1710, 1640 cm-1 ; 1H nmr (CDCl3, 90MHz): delta 3.63 (3H,s), 3.75 (3H,s), 5.05 (2H,s), 6.80-7.40 (9H,m), 7.50 (1H,s)ppm. After ninety minutes the solution was extracted with ether (2 x 300 ml) After washing with water (3 x 150 ml) and brine the extracts were dried concentrated under reduced pressure Recrystallization from dry methanol

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Methyl 2-benzyloxyphenylacetate (26.99 g) and methyl formate (126.62 g) in dry DMF (300 ml) were added dropwise to a stirred suspension of sodium hydride (50% disp. in oil, 10.13 g) in DMF (300 ml) at 0° C. After stirring at 0° C. for two hours the mixture was poured into water (1000 ml) and washed with ether (2 x 150 ml). The aqueous layer was acidified to pH4 with 6M hydrochloric acid then extracted with ether (2 x 350 ml). The extracts were dried and concentrated under reduced pressure to afford crude methyl 3-hydroxy-2-[2'-benzyloxyphenyl]propenoate as a yellow oil, infrared maxima (film): 1720, 1660 cm-1. washed with ether (2 x 150 ml) then extracted with ether (2 x 350 ml) The extracts were dried concentrated under reduced pressure