5-chloropentan-2-one

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 5-Chloro-2-pentanone (2.4 mL, 20.9 mmol) was added to a DMF (50 mL) solution of methyl (4-piperidin-4-ylidene-4,10-dihydro-9-oxa-3-thiabenzo[f]azulen-6-yl)acetate (2.50 g, 7.0 mmol), anhydrous potassium carbonate (2.15 g, 15.6 mmol), and potassium iodide (1.41 g, 8.5 mmol), and the mixture was stirred overnight at 80° C. The solvents were distilled off under a reduced pressure, water was added to the residue, and the product was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate, and the solvents were then distilled off under a reduced pressure. The residue was purified by column chromatography (chloroform:methanol=19:1), to give 2.40 g (78%) of the captioned compound in the form of an oily product. The solvents were distilled off under a reduced pressure, water was added to the residue the product was extracted with ethyl acetate The organic layer was dried over anhydrous sodium sulfate the solvents were then distilled off under a reduced pressure The residue was purified by column chromatography (chloroform:methanol=19:1)

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

Procedure: A mixture of 21.77 gm (180.5 mMol) 5-chloro-2-pentanone, 13.40 gm (164.3 mMol) dimethylamine hydrochloride and 50.0 gm (361.8 mMol) potassium carbonate in 150 mL acetonitrile was stirred at room temperature for 2 days and then at reflux for 2 hours. The reaction mixture was then cooled to room temperature and partitioned between water and dichloromethane. The phases were separated and the aqueous phase again extracted with dichloromethane. All organic phases were combined, dried over sodium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel chromatography, eluting with dichloromethane containing 10% methanol and 1% ammonium hydroxide. Fractions shown to contain product were combined and concentrated under reduced pressure. The desired product was then isolated by distillation. at reflux for 2 hours The reaction mixture was then cooled to room temperature partitioned between water and dichloromethane The phases were separated the aqueous phase again extracted with dichloromethane dried over sodium sulfate concentrated under reduced pressure eluting with dichloromethane containing 10% methanol and 1% ammonium hydroxide concentrated under reduced pressure

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 24.59 g (132.8 mmol) of potassium phthalimide are added to a solution of 14.3 ml (124.4 mmol) of 5-chloro-2-pentanone in 100 ml of DMF and the mixture is left to stir at room temperature for 3 h and at 60° C. for 30 h. After filtering, the filtrate is partitioned between water and dichloromethane. The phases are separated and the organic phase is washed successively with water, twice with an 0.2N solution of NaOH and water and then dried over sodium sulfate. After filtering, the solvent is removed in vacuo and the residue is chromatographed through silica gel using heptane/ethyl acetate=6/4. 9.8 g (34%) of (14.1) are obtained after concentrating the product fractions. the mixture is left After filtering the filtrate is partitioned between water and dichloromethane The phases are separated the organic phase is washed successively with water, twice with an 0.2N solution of NaOH and water dried over sodium sulfate After filtering the solvent is removed in vacuo the residue is chromatographed through silica gel

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

Procedure: Combine (1H-benzimidazol-2-yl)(1-(t-butoxycarbonyl)piperidin-4-yl)amine (3.5 mmol) and tetrahydrofuran (45 mL) and dimethylformamide (5 mL). Cool in an ice bath and add sodium hydride (0.21 g, 60% in oil, 5.22 mmol). After 1 hour, add 5-chloropentan-2-one, ethylene ketal (0.79 mL, 5.22 mmol) and tetra-n-butylammonium bromide (112 mg, 0.35 mmol) and warm to ambient temperature. Heat to reflux. After 18 hours, cool, add sodium hydride (0.1 g) and 5-chloropentan-2-one, ethylene ketal (0.50 mL) and again heat to reflux. After 24 hours, cool in a dry-ice/acetone bath and add a saturated aqueous solution of ammonium chloride. Warm to ambient temperature and dilute the reaction mixture with a saturated aqueous solution of sodium bicarbonate. Concentrate in vacuo to remove most to the tetrahydrofuran and extract three times with ethyl acetate. Extract the combined organic layers with water and then brine, dry the organic layer over Na2SO4, filter, and evaporate in vacuo to give a residue. Chromatograph the residue on silica gel eluting with 5% methanol/dichloromethane/0.1% saturated aqueous ammonia solution to give (1-(4-oxopentyl)-1H-benzimidazol-2-yl)(1-(t-butoxycarbonyl)piperidin-4-yl)amine, ethylene ketal. Cool in an ice bath Heat to reflux After 18 hours cool again heat to reflux After 24 hours cool in a dry-ice/acetone bath Warm to ambient temperature Concentrate in vacuo to remove most to the tetrahydrofuran extract three times with ethyl acetate Extract the combined organic layers with water brine, dry the organic layer over Na2SO4 filter evaporate in vacuo to give a residue

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

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

Procedure: A solution of 134 g (0.83 mol) of bromine in 130 ml of methylene chloride is added dropwise at 10° C. with stirring to a solution of 100 g (0.83 mol) of 5-chloropentan-2-one in 400 ml of methylene chloride. The reaction mixture is stirred for a further hour at room temperature, then washed using water and dilute aqueous sodium carbonate solution and dried over sodium sulphate. The mixture is concentrated by stripping off the solvent under reduced pressure, and the residue is taken up in 200 ml of methanol and 63 g (0.83 mol) of n-propylmercaptan are added at 5° C. with stirring. A mixture of 93 g of potassium hydroxide powder in 500 ml of methanol is then added dropwise. The reaction mixture is initially stirred for 2 hours at room temperature and then for 4 hours at 40° C. The mixture is then concentrated by stripping off the solvent under reduced pressure and the remaining residue is taken up in methylene chloride. The organic solution is washed successively using water, dilute aqueous sodium hydroxide solution and again using water, then concentrated under reduced pressure and then subjected to a vacuum distillation. In this manner, 42 g (32% of theory) of 1-acetyl-1-propylmercaptocyclopropane of boiling point 107° C./20 mbar are obtained. washed dried over sodium sulphate The mixture is concentrated with stirring is then added dropwise The reaction mixture is initially stirred for 2 hours at room temperature The mixture is then concentrated The organic solution is washed successively using water, dilute aqueous sodium hydroxide solution and again using water concentrated under reduced pressure subjected to a vacuum distillation

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

Procedure: A solution of 134 g (0.83 mol) of bromine in 130 ml of methylene chloride is added dropwise at 10° C. with stirring to a solution of 100 g (0.83 mol) of 5-chloropentan-2-one in 400 ml of methylene chloride. The reaction mixture is stirred for a further hour at room temperature, then washed using water and dilute aqueous sodium carbonate solution and dried over sodium sulphate. The mixture is concentrated by stripping off the solvent under reduced pressure, the residue is taken up in 200 ml of methanol and 91.5 g (0.83 mol) of thiophenol are added at 5° C. with stirring. A mixture of 93 g of potassium hydroxide powder in 500 ml of methanol is then added dropwise. The reaction mixture is initially stirred for 2 hours at room temperature and then for 4 hours at 40° C. The mixture is then concentrated by stripping off the solvent under reduced pressure and the remaining residue is taken up in methylene chloride. The organic solution is washed successively using water, dilute aqueous sodium hydroxide solution and again using water, then concentrated under reduced pressure and then subjected to a vacuum distillation. In this manner, 76.8 g (48% of theory) of methyl 1-phenyl-mercaptocyclopropyl ketone of boiling point 155° C./20 mbar are obtained. washed dried over sodium sulphate The mixture is concentrated with stirring is then added dropwise The reaction mixture is initially stirred for 2 hours at room temperature The mixture is then concentrated The organic solution is washed successively using water, dilute aqueous sodium hydroxide solution and again using water concentrated under reduced pressure subjected to a vacuum distillation

Conditions: temp:-5.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 6.69 g. of magnesium in 20 ml. of ether under argon, is added 0.1 g. of mercuric chloride and 0.1 g. of dibromoethane. The mixture is stirred for 10 minutes and 0.5 ml. of propargyl bromide is added. A 50 ml. portion of ether is added, followed by a solution of 30 g. of 5-chloro-2-pentanone and 32.55 g. of propargyl bromide in 45 ml. of ether with stirring, at a rate to maintain vigorous reflux. The mixture is stirred an additional 15 minutes, cooled to -5° C. and an ice cold saturated solution of ammonium chloride is added dropwise. The ether layer is decanted and filtered. The solids are washed with ether which is also filtered. The combined ether filtrates are washed with water, dried over magnesium sulfate and the solvent removed giving the product as an orange oil. To a mixture of 6.69 g to maintain vigorous reflux The mixture is stirred an additional 15 minutes The ether layer is decanted filtered The solids are washed with ether which is also filtered The combined ether filtrates are washed with water dried over magnesium sulfate the solvent removed