Stereoselective Synthesis of the 5,5-Difluoro-(12R)- and -(12S)-Leukotrienes B3
作者:Vijaya Lingam Manthati、Danielle Grée、René Grée
DOI:10.1002/ejoc.200500200
日期:2005.9
The first synthesis of the 5,5-difluoro-(12R)- and -(12S)-leukotrienesB3 is reported which uses a flexible and convergent strategy. The key steps involve a Sonogashira coupling between the bromodienone 4 and the propargylic difluoride 5; this is followed by a CBS type reduction to establish the (12R) or (12S) stereocenters. A final semihydrogenation, under controlled conditions, affords the required