作者:Masaharu Kume、Hiroaki Ooka、Hiroyuki Ishitobi
DOI:10.1016/s0040-4020(96)01093-9
日期:1997.2
An efficient and practical method of synthesizing 1 beta-methylcarbapenem, S-4661, was developed. (4R)-4-[(1S)-1-Methylallyl]-2-azetidinone, 2, prepared stereoselectively from commercially available acetoxy-azetidinone 3, was converted to the beta-keto ester 6 in four steps. The iodonium ylide 5 was prepared from 6, then cyclized to obtain the bicyclic beta-keto ester 4. Finally, 4 was processed to the target product, S-4661, by conventional procedures. (C) 1997, Elsevier Science Ltd.