An amino acid derivative of the formula: ##STR1## wherein R.sup.1 is a protective group for hydroxyl, which is useful as an intermediate for production of antimicrobial agent.
Nitrone Cycloaddition Route to the 1β-Methylcarbapenem Key Intermediate
作者:Yoshio Ito、Yoshikazu Kimura、Shiro Terashima
DOI:10.1246/bcsj.60.3337
日期:1987.9
The 1β-methylcarbapenemkeyintermediate, (3S,4S)-3-[(R)-1-(t-butyldimethylsilyloxy)ethyl]-4-[(R)-1-carboxyethyl]-2-azetidinone, was prepared from (S)-methyl 3-hydroxy-2-methylpropionate by employing 1,3-dipolar cycloaddition of the chiral nitrone with benzyl crotonate as a key reaction.