Acetone → t-Butyl 2-benzyloxycarbonylamino-2-carbamoyl-3-[(-)-menthyloxycarbonyl]propionate

Participants

Reaction Steps

t-Butyl 2-benzyloxycarbonylamino-2-cyano-3-[(−)-menthyloxycarbonyl]propionate (2.00 g, 4.11 mmol) and acetone (10 ml) were mixed and an aqueous solution of potassium carbonate (566 mg, 5.34 mmol) in water (5.0 ml) was added thereto. Further, 30% aqueous hydrogen peroxide solution (1.6 ml) was added dropwise and the mixture was stirred for about 6 hours. When completion of the reaction was confirmed, water was added and the precipitated crystals were filtered, washed with sprayed water and hexane to give t-butyl 2-benzyloxycarbonylamino-2-carbamoyl-3-[(−)-menthyloxycarbonyl]propionate (950 mg, yield 45.8%) as a pale yellow crystal. Optical purity of (2R)-derivative was 7.4% d.e.

Provenance & Evidence