2-(3-bromopropyl)-2-methyl-1,3-dioxolane

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.0 grams of 5-chloro-2-pentanone ethylene ketal is mixed with 9.0 grams of lithium bromide and 2.0 grams of diisopropylethylamine in 30 ml of tetrahydrofuran which has been distilled from lithium aluminum hydride. The mixture is refluxed under nitrogen for 48 hours, cooled and poured into a mixture of ether and water for extraction. The ether layer is washed twice with water, then with 1 N hydrochloric acid and then twice again with water. The ether layer is then dried over sodium sulfate and evaporated under reduced pressure to give title product. has been distilled from lithium aluminum hydride The mixture is refluxed under nitrogen for 48 hours cooled poured into a mixture of ether and water for extraction The ether layer is washed twice with water The ether layer is then dried over sodium sulfate evaporated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.0 grams of 5-chloro-2-pentanone ethylene ketal is mixed with 9.0 grams of lithium bromide and 2.0 grams of diisopropylethylamine in 30 ml of tetrahydrofuran which has been distilled from lithium aluminum hydride. The mixture is refluxed under nitrogen for 48 hours, cooled and poured into a mixture of ether and water for extraction. The ether layer is washed twice with water, then with 1 N hydrochloric acid and then twice again with water. The ether layer is then dried over sodium sulfate and evaporated under reduced pressure to give title product. has been distilled from lithium aluminum hydride The mixture is refluxed under nitrogen for 48 hours cooled poured into a mixture of ether and water for extraction The ether layer is washed twice with water The ether layer is then dried over sodium sulfate evaporated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A portion (10 ml) of a solution of 2-(3-bromopropyl)-2-methyl-1,3-dioxolane (27.5 g) in dry tetrahydrofuran (70 ml) and an iodine crystal were added to a mixture of magnesium (3.5 g) and tetrahydrofuran (10 ml). The mixture was heated under reflux and a further portion (10 ml) added. When the reaction had been initiated the remaining solution was added over 40 minutes and reflux was maintained. 1-(3,4-Dichlorophenyl)cyclobutanecarbonitrile (18 g) and then dry tetrahydrofuran (10 ml) were added and the resulting solution heated under reflux for two hours. The solution was cooled, a slurry of sodium borohydride (5 g) and propan-2-ol (50 ml) was added and the mixture stirred at ambient temperature for 16 hours. Propan-2-ol (100 ml) was added and the mixture heated under reflux for 2.75 hours and then cooled and poured into ice/water (1000 g). The aqueous mixture was extracted with ether and the extract was dried and evaporated to give 1 -[1-(3,4-dichlorophenyl)cyclobutyl]-4-(2-methyl-1,3-dioxolan-2-yl)butylamine. The mixture was heated under reflux a further portion (10 ml) added was added over 40 minutes reflux was maintained the resulting solution heated under reflux for two hours The solution was cooled the mixture heated under reflux for 2.75 hours cooled The aqueous mixture was extracted with ether the extract was dried evaporated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 14 g of sodium hydride in a 50% suspension in oil were added to a solution of 28 g of 4-methyl-3-pentenol [Julia et al, Bull. Soc. Chim., (1960), p. 1072] in 250 ml of dimethylformamide and after stirring the mixture for 1 hour, 66 g of 5-bromo-2,2-ethylenedioxy-pentane were added thereto while keeping the temperature below 35° C. The mixture was stirred at room temperature for 17 hours and the reaction mixture was then poured into water. The mixture was extracted with petroleum ether (b.p.= 40°-75° C.) and the organic phase was washed with water, dried over sodium sulfate and evaporated to dryness. The residue was rectified to obtain 20 g of 2,2-ethylenedioxy-10-methyl-6-oxa-9-undecene in the form of a colorless liquid with a boiling point of 75° C. at 0.05 mm Hg. the temperature below 35° C The mixture was stirred at room temperature for 17 hours The mixture was extracted with petroleum ether (b.p.= 40°-75° C.) the organic phase was washed with water dried over sodium sulfate evaporated to dryness

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 14 g of sodium hydride in a 50% suspension in oil were added to a solution of 28 g of 4-methyl-3-pentenol [Julia et al, Bull. Soc. Chim., (1960), p. 1072] in 250 ml of dimethylformamide and after stirring the mixture for 1 hour, 66 g of 5-bromo-2,2-ethylenedioxy-pentane were added thereto while keeping the temperature below 35° C. The mixture was stirred at room temperature for 17 hours and the reaction mixture was then poured into water. The mixture was extracted with petroleum ether (b.p.= 40°-75° C.) and the organic phase was washed with water, dried over sodium sulfate and evaporated to dryness. The residue was rectified to obtain 20 g of 2,2-ethylenedioxy-10-methyl-6-oxa-9-undecene in the form of a colorless liquid with a boiling point of 75° C. at 0.05 mm Hg. the temperature below 35° C The mixture was stirred at room temperature for 17 hours The mixture was extracted with petroleum ether (b.p.= 40°-75° C.) the organic phase was washed with water dried over sodium sulfate evaporated to dryness

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 14 g of sodium hydride in a 50% suspension in oil were added to a solution of 28 g of 4-methyl-3-pentenol [Julia et al, Bull. Soc. Chim., (1960), p. 1072] in 250 ml of dimethylformamide and after stirring the mixture for 1 hour, 66 g of 5-bromo-2,2-ethylenedioxy-pentane were added thereto while keeping the temperature below 35° C. The mixture was stirred at room temperature for 17 hours and the reaction mixture was then poured into water. The mixture was extracted with petroleum ether (b.p.= 40°-75° C.) and the organic phase was washed with water, dried over sodium sulfate and evaporated to dryness. The residue was rectified to obtain 20 g of 2,2-ethylenedioxy-10-methyl-6-oxa-9-undecene in the form of a colorless liquid with a boiling point of 75° C. at 0.05 mm Hg. the temperature below 35° C The mixture was stirred at room temperature for 17 hours The mixture was extracted with petroleum ether (b.p.= 40°-75° C.) the organic phase was washed with water dried over sodium sulfate evaporated to dryness

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.0 Parts of 5-chloro-2-pentanone ethylene ketal is mixed with 9.0 parts of lithium bromide and 2.0 parts of diisopropylethylamine in 30 parts by volume of tetrahydrofuran which has been distilled from lithium aluminum hydride. The mixture is refluxed under nitrogen for 48 hours, cooled and poured into a mixture of ether and water for extraction. The ether layer is washed twice with water, then with 1 N hydrochloric acid and then twice again with water. The ether layer is then dried over sodium sulfate and evaporated under reduced pressure to give 5-bromo-2-pentanone ethylene ketal of formula XXI of Chart C. has been distilled from lithium aluminum hydride The mixture is refluxed under nitrogen for 48 hours cooled poured into a mixture of ether and water for extraction The ether layer is washed twice with water The ether layer is then dried over sodium sulfate evaporated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.0 Parts of 5-chloro-2-pentanone ethylene ketal is mixed with 9.0 parts of lithium bromide and 2.0 parts of diisopropylethylamine in 30 parts by volume of tetrahydrofuran which has been distilled from lithium aluminum hydride. The mixture is refluxed under nitrogen for 48 hours, cooled and poured into a mixture of ether and water for extraction. The ether layer is washed twice with water, then with 1 N hydrochloric acid and then twice again with water. The ether layer is then dried over sodium sulfate and evaporated under reduced pressure to give 5-bromo-2-pentanone ethylene ketal having the formula ##STR6## has been distilled from lithium aluminum hydride The mixture is refluxed under nitrogen for 48 hours cooled poured into a mixture of ether and water for extraction The ether layer is washed twice with water The ether layer is then dried over sodium sulfate evaporated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A portion (10 ml) of a solution of 2-(3-bromopropyl)-2-methyl-1,3-dioxolane (27.5 g) in dry tetrahydrofuran (70 ml) and an iodine crystal were added to a mixture of magnesium (3.5 g) and tetrahydrofuran (10 ml). The mixture was heated under reflux and a further portion (10 ml) added. When the reaction had been initiated the remaining solution was added over 40 minutes and reflux was maintained. 1-(3,4-Dichlorophenyl)cyclobutanecarbonitrile (18 g) and then dry tetrahydrofuran (10 ml) were added and the resulting solution heated under reflux for two hours. The solution was cooled, a slurry of sodium borohydride (5 g) and propan-2-ol (50 ml) was added and the mixture stirred at ambient temperature for 16 hours. Propan-2-ol (100 ml) was added and the mixture heated under reflux for 2.75 hours and then cooled and poured into ice/water (1000 g). The aqueous mixture was extracted with ether and the extract was dried and evaporated to give 1-[1-(3,4-dichlorophenyl)cyclobutyl]-4-(2-methyl-1,3-dioxolan-2-yl)butylamine. The mixture was heated under reflux a further portion (10 ml) added was added over 40 minutes reflux was maintained the resulting solution heated under reflux for two hours The solution was cooled the mixture heated under reflux for 2.75 hours cooled The aqueous mixture was extracted with ether the extract was dried evaporated

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A suspension of 29.0 g of imidazole and 23.1 g of sodium methoxide in 385 ml of dimethylformamide was stirred for 30 minutes and cooled in an ice bath as 85.8 g of 3-(2-methyl-1,3-dioxolan-2-yl)propyl bromide was added dropwise. The resulting mixture was maintained at room temperature for 30 minutes and heated to reflux for 1 hour. The solvent was evaporated in vacuo, the residue diluted with acetone and filtered. The filtrate was concentrated and the residue was distilled to afford 37.9 g (47%) of 1-[2-(2-methyl-1,3-dioxolan-2-yl)propyl]-1H-imidazole as a colorless oil, bp 102°-108° C./0.1 mm. was added dropwise heated to reflux for 1 hour The solvent was evaporated in vacuo the residue diluted with acetone filtered The filtrate was concentrated the residue was distilled

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4.0 grams of 5-chloro-2-pentanone ethylene ketal is mixed with 9.0 grams of lithium bromide and 2.0 grams of diisopropylethylamine in 30 ml of tetrahydrofuran which has been distilled from lithium aluminum hydride. The mixture is refluxed under nitrogen for 48 hours, cooled and poured into a mixture of ether and water for extraction. The ether layer is washed twice with water, then with 1 N hydrochloric acid and then twice again with water. The ether layer is then dried over sodium sulfate and evaporated under reduced pressure to give title product. has been distilled from lithium aluminum hydride The mixture is refluxed under nitrogen for 48 hours cooled poured into a mixture of ether and water for extraction The ether layer is washed twice with water The ether layer is then dried over sodium sulfate evaporated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A portion (10 ml) of a solution of 2-(3-bromopropyl)-2-methyl-1,3-dioxolane (27.5 g) in dry tetrahydrofuran (70 ml) and an iodine crystal were added to a mixture of magnesium (3.5 g) and tetrahydrofuran (10 ml). The mixture was heated under reflux and a further portion (10 ml) added. When the reaction had been initiated the remaining solution was added over 40 minutes and reflux was maintained. 1-(3,4-Dichlorophenyl)cyclobutanecarbonitrile (18 g) and then dry tetrahydrofuran (10 ml) were added and the resulting solution heated under reflux for two hours. The solution was cooled, a slurry of sodium borohydride (5 g) and propan-2-ol (50 ml) was added and the mixture stirred at ambient temperature for 16 hours. Propan-2-ol (100 ml) was added and the mixture heated under reflux for 2.75 hours and then cooled and poured into ice/water (1000 g). The aqueous mixture was extracted with ether and the extract was dried and evaporated to give 1 -[1-(3,4-dichlorophenyl)cyclobutyl]-4-(2-methyl-1,3-dioxolan-2-yl)butylamine. The mixture was heated under reflux a further portion (10 ml) added was added over 40 minutes reflux was maintained the resulting solution heated under reflux for two hours The solution was cooled the mixture heated under reflux for 2.75 hours cooled The aqueous mixture was extracted with ether the extract was dried evaporated