4-Methylmorpholine → D-1-N-Boc-prolinamide

Participants

Reaction Steps

N-Methylmorpholine (9.85 g, 97.5 mmol) and isobutyl chloroformate (13.33 g, 97.5 mmol) was added to (R)-pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester (20.0 g, 92.9 mmol) in THF (200 mL) at −78° C. and stirred for 1 h. Ammonium hydroxide (58 mL) was added slowly as the reaction warmed up to RT and stirred for a further 2 h. The reaction mixture was partitioned between DCM and water. The organic extracts were washed with 1 M HCl, dried over sodium sulphate, filtered and concentrated to afford the title product (10.8 g, 54%) as a colourless semisolid.

Provenance & Evidence