3H-呋喃-2-酮

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: 47 g (0.376 mol) of p-fluorobenzylamine, 30.4 g (0.353 mol) of furan-2-one and 0.4 g of hydroquinone are introduced into a 125 ml autoclave. After driving the air out of the apparatus by passing a stream of nitrogen through it, the mixture is heated to 250° for 6 hours. It is then cooled and distilled under reduced pressure. 51 g (yield=74.8%) of 1-p-fluorobenzyl-pyrrolidin-2-one are collected as a colourless liquid distilling at 103°-105° under a pressure of 0.01 mm of mercury and solidifying slowly. Melting point=37°-38°. the mixture is heated to 250° for 6 hours It is then cooled distilled under reduced pressure

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

实验步骤: 47 g (0.376 mol) of p-fluorobenzylamine, 30.4 g (0.353 mol) of furan-2-one and 0.4 g of hyddroquinone are introduced into a 125 ml autoclave. After driving the air out of the apparatus by passing a stream of nitrogen through it, the mixture is heated to 250° for 6 hours. It is then cooled and distilled under reduced pressure. 51 g (yield=74.8%) of 1-p-fluorobenzyl-pyrrolidin-2-one are collected as a colourless liquid distilling at 103°-105° under a pressure of 0.01 mm of mercury and solidifying slowly. Melting point=37°-38°. the mixture is heated to 250° for 6 hours It is then cooled distilled under reduced pressure

反应条件: temp:71.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture containing 750 grams of 3-acetyl-5-butyl-dihydro-2 (3H)-furanone (4.0 mols), 750 grams of cyclohexane and 8.6 grams of sodium hydrogen sulfate were heated to reflux. To the refluxing mixture were added 250 grams of ethylene glycol (4.0 mols) over a period of 6 hours while the water formed by the reaction was collected in a Dean Stark Trap. An additional 110 grams of ethylene glycol (1.8 mols) was added over 22 hours to replace glycol carried over with the refluxing cyclohexane (azeotropic agent). After 36 hours, an analysis of the reaction mixture showed that the furanone was 95.4 percent converted to a ketal of the formula ##STR21## An aliquot of 94.5 grams of the mixture (0.22 mols) and 30.5 grams of anhydrous ethanol (0.66 mols) and 0.6 grams of p-toluene sulfonic acid were refluxed at 71° C. for 26 hours. The mixture was then neutralized with 0.73 grams of sodium ethoxide followed by stripping on a Rotovap under vacuum to a temperature of 90° C. The residue was water washed, dried on a Rotovap and distilled to provide 29.6 grams of 2-butyl-4-carbethoxy-5-methyl-2,3-dihydrofuran. The amount of recovered material represented a yield of 63.5 percent based on the amount of furanone reacted and a yield of 66.9% based on a 93.0% conversion of the ketal. were heated to reflux formed by the reaction was collected in a Dean Stark Trap by stripping on a Rotovap under vacuum to a temperature of 90° C washed dried on a Rotovap distilled

反应条件: temp:71.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A mixture containing 750 grams of 3-acetyl-5-butyl-dihydro-2 (3H)-furanone (4.0 mols), 750 grams of cyclohexane and 8.6 grams of sodium hydrogen sulfate were heated to reflux. To the refluxing mixture were added 250 grams of ethylene glycol (4.0 mols) over a period of 6 hours while the water formed by the reaction was collected in a Dean Stark Trap. An additional 110 grams of ethylene glycol (1.8 mols) was added over 22 hours to replace glycol carried over with the refluxing cyclohexane (azeotropic agent). After 36 hours, an analysis of the reaction mixture showed that the furanone was 95.4 percent converted to a ketal of the formula ##STR21## An aliquot of 94.5 grams of the mixture (0.22 mols) and 30.5 grams of anhydrous ethanol (0.66 mols) and 0.6 grams of p-toluene sulfonic acid were refluxed at 71° C. for 26 hours. The mixture was then neutralized with 0.73 grams of sodium ethoxide followed by stripping on a Rotovap under vacuum to a temperature of 90° C. The residue was water washed, dried on a Rotovap and distilled to provide 29.6 grams of 2-butyl-4-carbethoxy-5-methyl-2,3-dihydrofuran. The amount of recovered material represented a yield of 63.5 percent based on the amount of furanone reacted and a yield of 66.9% based on a 93.0% conversion of the ketal. were heated to reflux formed by the reaction was collected in a Dean Stark Trap by stripping on a Rotovap under vacuum to a temperature of 90° C washed dried on a Rotovap distilled

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

实验步骤: 47 g (0.376 mol) of p-fluorobenzylamine, 30.4 g (0.353 mol) of furan-2-one and 0.4 g of hydroquinone are introduced into a 125 ml autoclave. After driving the air out of the apparatus by passing a stream of nitrogen through it, the mixture is heated to 250° for 6 hours. It is then cooled and distilled under reduced pressure. 51 g (yield=74.8%) of 1-p-fluorobenzyl-pyrrolidin-2-one are collected as a colourless liquid distilling at 103°-105° under a pressure of 0.01 mm of mercury and solidifying slowly. Melting point=37°-38°. the mixture is heated to 250° for 6 hours It is then cooled distilled under reduced pressure

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

实验步骤: 47 g (0.376 mol) of p-fluorobenzylamine, 30.4 g (0.353 mol) of furan-2-one and 0.4 g of hydroquinone are introduced into a 125 ml autoclave. After driving the air out of the apparatus by passing a stream of nitrogen through it, the mixture is heated to 250° for 6 hours. It is then cooled and distilled under reduced pressure. 51 g (yield=74.8%) of 1-p-fluorobenzyl-pyrrolidin-2-one are collected as a colourless liquid distilling at 103°-105° under a pressure of 0.01 mm of mercury and solidifying slowly. Melting point=37°-38°. the mixture is heated to 250° for 6 hours It is then cooled distilled under reduced pressure

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

实验步骤: 47 g (0.376 mol) of p-fluorobenzylamine, 30.4 g (0.353 mol) of furan-2-one and 0.4 g of hyddroquinone are introduced into a 125 ml autoclave. After driving the air out of the apparatus by passing a stream of nitrogen through it, the mixture is heated to 250° for 6 hours. It is then cooled and distilled under reduced pressure. 51 g (yield=74.8%) of 1-p-fluorobenzyl-pyrrolidin-2-one are collected as a colourless liquid distilling at 103°-105° under a pressure of 0.01 mm of mercury and solidifying slowly. Melting point=37°-38°. the mixture is heated to 250° for 6 hours It is then cooled distilled under reduced pressure

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

实验步骤: The process of Example 1 was carried out except that the aldehyde was 2-(2,2,3-trimethylcyclopent-3-en-yl) ethaldehyde and the furanone did not contain a 5-methyl group to obtain (E)-3-[2-(2,2,3-trimethylcyclopent-3-en-yl)ethenyl]dihydro-2 (3H)-furanone. 1HNMR (CDCl3) [Redistilled E isomer] δ6.80 (m, 1H), 5.24 (close spaced m, 1H), 4.40 (t, 2H), 2.93 (m, 2H), 2.45-1.77 (m, 6H), 1.62 (close spaced m, 3H), 1.04 (s, 3H), 0.85 (s, 3H). BP 1.38°-156 ° C. at 0.20 mm Hg Yield 42-57%

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 process of Example 1 was carried out except that the aldehyde was 2-(2,2,3-trimethylcyclopent-3-en-yl) ethaldehyde and the furanone did not contain a 5-methyl group to obtain (E)-3-[2-(2,2,3-trimethylcyclopent-3-en-yl)ethenyl]dihydro-2 (3H)-furanone. 1HNMR (CDCl3) [Redistilled E isomer] δ6.80 (m, 1H), 5.24 (close spaced m, 1H), 4.40 (t, 2H), 2.93 (m, 2H), 2.45-1.77 (m, 6H), 1.62 (close spaced m, 3H), 1.04 (s, 3H), 0.85 (s, 3H). BP 1.38°-156 ° C. at 0.20 mm Hg Yield 42-57%

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

实验步骤: 47 g (0.376 mol) of p-fluorobenzylamine, 30.4 g (0.353 mol) of furan-2-one and 0.4 g of hydroquinone are introduced into a 125 ml autoclave. After driving the air out of the apparatus by passing a stream of nitrogen through it, the mixture is heated to 250° for 6 hours. It is then cooled and distilled under reduced pressure. 51 g (yield = 74.8%) of 1-p-fluorobenzyl-pyrrolidin-2-one are collected as a colourless liquid distilling at 103°-105° under a pressure of 0.01 mm of mercury and solidifying slowly. Melting point = 37°-38°. the mixture is heated to 250° for 6 hours It is then cooled distilled under reduced pressure