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    • 9. 发明专利
    • PRODUCTION OF 2-AZETIDINONE DERIVATIVE
    • JPH04154758A
    • 1992-05-27
    • JP27519590
    • 1990-10-16
    • LEDERLE JAPAN LTD
    • NAGAO YOSHIMITSUMATSUNAGA HIROSHIKUMAGAI TOSHIO
    • C07D205/08C07C235/08
    • PURPOSE:To readily and highly stereoselectively obtain the subject compound which is a synthetic raw material for carbapenem compounds useful as an antimicrobial agent in good yield by subjecting a new compound as a raw material to condensation cyclizing reaction and then, as necessary, eliminating protecting groups of OH, etc. CONSTITUTION:Carboxylic acids expressed by formula I (R is protecting group of OH) are made to react with a compound expressed by formula II (R is lower alkyl) to produce a compound expressed by formula III, which is subsequently reacted with a tin(II) triflate in the presence of a base to provide an enolate. The resultant enolate is then reacted with acetaldehyde to afford a compound expressed by formula IV. The OH of the obtained compound expressed by formula IV is subsequently protected to afford a compound expressed by formula V (R is R ), which is then allowed to react with a 4-lower alkoxyphenylamine to produce a compound expressed by formula VI (R is R ). The protecting group R of the OH is subsequently eliminated therefrom to form a new compound expressed by formula VII which is a raw material. The resultant compound expressed by formula VII is then subjected to condensing reaction and, as necessary, the protecting group of OH or the 4-lower alkoxyphenyl group or both are eliminated to afford the objective compound expressed by formula VIII.