Chemoenzymatic total synthesis and determination of the absolute configuration of (S)-nebracetam
作者:Sho Yamashita、Nobuyuki Mase、Kunihiko Takabe
DOI:10.1016/j.tetasy.2008.09.004
日期:2008.9
by a chemoenzymatic strategy. Diastereoselective Michaeladdition of nitromethane to the chiral lactam (S)-9d (>99% ee), which was prepared by lipase-catalyzed kineticresolution, afforded the Michael product 10d in 99% yield with 86% de. Chemical transformations of 10d including recrystallization furnished the chiral nebracetam 3 and its derivative. The absolute configuration of the chiral (−)-nebracetam