Pyridine → 3-Carbamoylisoxazol-5-ylmethyl 4-nitrophenyl carbonate

Participants

Reaction Conditions

Reaction Steps

2.84 g (14.07 mmoles) of 4-nitrophenyl chloroformate are added in small portions to a solution of 2.0 g (14.07 mmoles) of 3-methylcarbamoyl-isoxazol-5-yl-methanol (commercial), 1.71 ml (21.11 mmoles) of pyridine and 0.17 g (1.41 moles) of N,N-dimethylaminopyridine in 15 ml of dichloromethane, cooled to about 0° C. The medium is maintained with stirring for 1 hr at 0° C. then for 1 hr at ambient temperature. The precipitate formed is filtered off then copiously rinsed with diisopropyl ether. After drying under vacuum at about 60° C., 3.12 g of the expected product are obtained in the form of a white solid used as such in the following stage.

Provenance & Evidence