Methanol → HCID 22841883, compound

Participants

Reaction Steps

(3S,4S)-4-(1-Carboxyethenyl)-3-(1-(R)-benzyloxycarbonyloxyethyl)-2-azetidinone (37 g), which was prepared from (3S,4S)-4-(1-formylethenyl)-3-(1-(R)-benzyloxycarbonyloxyethyl)-2-azetidinone in the similar procedure to Example 6, was dissolved in methanol and then diluted with diethyl ether. A solution of diazomethane in diethyl ether was added dropwise thereto with ice-cooling, and the resultant mixture was stirred for 0.5 hour. After removal of excess diazomethane, the reaction mixture was concentrated in vacuo to give (3S,4S)-4-(1-methoxycarbonylethenl)-3-(1-(R)-benzyloxycarbonyloxyethyl)-2-azetidinone.

Provenance & Evidence