4-Methylmorpholine → HCID 66688142, compound

Participants

Reaction Conditions

Reaction Steps

A solution consisting of 10 g of Boc-D-Phe-OH, 40 ml of dichloromethane and 4.6 ml of N-methylmorpholine is slowly dripped into a solution of 5.4 ml of isobutyl chloroformate in 60 ml of dichloromethane cooled to 0° C., at a rate such that the inner temperature does not exceed 5° C. The resulting mixture is maintained under stirring at 0° C. for 1 hour. A solution consisting of 8.0 g of (11) in 20 ml of dichloromethane is dripped into the reaction mixture at a rate such that the temperature does not exceed 5° C. The solution is maintained under stirring at 0° C. for 1 hour, and at ambient temperature for 5 hours. After a process control, 100 ml of 1M NaOH is added to the mixture, the two phases are separated, the organic phase is washed with water (2×), and after a low-pressure solvent change with ethyl acetate compound (12) is crystallised from ethyl acetate, to obtain 14.29 g of white solid. Yield 83%.

Provenance & Evidence