Abstract
AbstractThe first synthesis of the 5,5‐difluoro‐(12R)‐ and ‐(12S)‐leukotrienes B3 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 E,E,Z trienic system. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)
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