Hydrochloric Acid → HCID 69669934, compound

Participants

Reaction Steps

(COCl)2 (10 g, 79 mmol, 6.9 mL) and DMF (50 μL) were carefully added to 1-(2-isopropyl-5-methyl-cyclohexyl)-5-oxo-pyrrolidine-3-carboxylic acid (obtained as in EXAMPLE II, 10 g, 37.4 mmol) suspended in anhydrous CH2Cl2 (150 mL). The reaction mixture slowly turned into a homogeneous solution over about 3 hours, which was then concentrated in vacuo and dissolved in anhydrous CH2Cl2. The reaction mixture was subsequently added dropwise to a mixture of DIEA (9.7 g, 74.8 mmol) and piperidine (3.99 g, 56 mmol) at 0° C. with stirring. The reaction mixture was allowed to warm to room temperature and stirred for 3 hours. The reaction mixture was poured into HCl (1 N) and extracted with CH2Cl2. The organic phases were collected, washed with brine, dried, and evaporated. Column chromatography with dichloromethane:methanol (95:5) provided 1-(2-isopropyl-5-methyl-cyclohexyl)-4-(piperidine-1-carbonyl)-pyrrolidin-2-one (10.8 g).

Provenance & Evidence