4-(bromomethyl)-1,1-difluorocyclohexane

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:0.00; pressure:0.00; stir:

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

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

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Zinc powder (1.43 g, 21.87 mmol) was added to a dried flask and was heated at 70° C. under vacuum for 30 minutes. Dry DMA (29 mL) and iodine (0.092 g, 0.37 mmol) were added and the mixture was heated at 70° C. until the red-brown colour had disappeared (approx. 5 minutes). 4-(Bromomethyl)-1,1-difluorocyclohexane (3.1 g, 14.55 mmol) was added and heating was continued for ca. 42 h. The resulting solution was used in the next transformation. the mixture was heated at 70° C. until the red-brown colour (approx. 5 minutes) heating

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: (4,4-Difluorocyclohexyl)methanol (7.22 g, 48.08 mmol) and triphenylphosphine (25.2 g, 96.16 mmol) were dissolved in DCM (75 mL) and cooled to 0° C. under nitrogen atmosphere. Carbon tetrabromide (31.9 g, 96.16 mmol) was dissolved in DCM (75 mL) and added to the reaction mixture. The mixture was stirred at room temperature overnight. The solvent was evaporated. Pentane (250 mL) was added to the orange residue, which caused triphenylphosphineoxide to precipitate. The off-white solids were filtered off. The filtrate was evaporated and purified on a ISOLUTE Silica Flash column (50 g). Pentane followed by EtOAc:pentane (1% EtOAc) was used as eluent. 4-(Bromomethyl)-1,1-difluorocyclohexane (5.48 g, 54%) was isolated. 1H NMR (400 MHz, cdcl3) δ 1.32-1.46 (m, 2H), 1.64-1.84 (m, 3H), 1.90-1.99 (m, 2H), 2.05-2.18 (m, 2H), 3.31 (d, 2H). added to the reaction mixture The solvent was evaporated Pentane (250 mL) was added to the orange residue, which to precipitate The off-white solids were filtered off The filtrate was evaporated purified on a ISOLUTE Silica Flash column (50 g)

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

Procedure: In 15 ml of acetone, 1.5 g of 4,4-difluorocyclohexylmethyl p-toluenesulfonate was dissolved. Thereto 1.6 g of lithium bromide monohydrate was added and the mixture was heated under reflux for 8 hours. After the reaction mixture was cooled to room temperature, water was added and the mixture was extracted with t-butyl methyl ether. The organic layer was washed with aqueous saturated sodium chloride, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to obtain 0.76 g of 4-bromomethyl-1,1-difluorocyclohexane. the mixture was heated under reflux for 8 hours the mixture was extracted with t-butyl methyl ether The organic layer was washed with aqueous saturated sodium chloride dried over anhydrous magnesium sulfate concentrated under reduced pressure

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

Procedure: 1.2 g of 2-(3,3,3-trifluoropropyl)malononitrile and 0.76 g of 4-bromomethyl-1,1-difluorocyclohexane were dissolved in 10 ml of N,N-dimethylformamide, 0.99 g of potassium carbonate was added, and the mixture was stirred at room temperature overnight. Thereafter, water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The organic layer was washed successively with dilute hydrochloric acid and aqueous saturated sodium chloride, dried over anhydrous magnesium sulfate, and then concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to obtain 0.51 g of 2-(4,4-difluorocyclohexyl)methyl-2-(3,3,3-trifluoropropyl)malononitrile (hereinafter, referred to as the present compound (83)). the mixture was extracted with ethyl acetate The organic layer was washed successively with dilute hydrochloric acid and aqueous saturated sodium chloride dried over anhydrous magnesium sulfate concentrated under reduced pressure

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