4-Chlorophenyl Isocyanate → HCID 9912033, compound

Participants

Reaction Steps

7.3 12.64 g (36.98 mmol) of N-[4-(3-oxomorpholin-4-yl)phenyl]-(2R,4R)-4-hydroxypyrrolidine-2-carboxamide hydrochloride are suspended in 1200 ml of dichloromethane, and 5.4 ml of triethylamine are added with cooling in an ice bath. The solution of 5.96 g (38.83 mmol) of 4-chlorophenyl isocyanate in 100 ml of dichlormethane is subsequently added dropwise to the mixture at 2° C. over the course of 1.5 hours, and the reaction solution is then left to stir for a further 30 minutes with ice cooling. The dichloromethane solution is then washed successively with 100 ml of 1N hydrochloric acid and 100 ml of water and dried over sodium sulfate. After the drying agent has been filtered off and the methylene chloride solution has been evaporated to ⅓ of the original volume in a rotary evaporator, the precipitated product is filtered off, washed with 50 ml of petroleum ether and dried in a desiccator, giving 14.6 g (86%) of 1-N-[(4-chlorophenyl)]-2-N-{[4-(3-oxomorpholin-4-yl)phenyl]}-(2R,4R)-4-hydroxypyrrolidine-1,2-dicarboxamide (“A8”) as a white powder, ESI 459; m.p. 216°.

Provenance & Evidence