Synthesis of the C1−C13 Tetraenoate Subunit of the Chivosazoles
摘要:
Using a combination of asymmetric vinylogous Mukaiyama aldol and Stifle cross-coupling reactions, an advanced polyene fragment of the chivosazoles was prepared in a highly stereocontrolled manner. This key C1-C13 pentaene subunit, featuring the conjugated (2E,4Z,6E,8Z)-tetraenoate motif and anti-configured C10 and C11 stereocenters of the chivosazoles, terminates in a (Z)-vinyl bromide for the planned cross-coupling to a northern hemisphere fragment.
作者:Douglass F. Taber、Han Yu、Christopher D. Incarvito、Arnold L. Rheingold
DOI:10.1021/ja981700v
日期:1998.12.1
The first enantioselective synthesis of (-)-isonitrin B (2), the parent of a small family of isonitrile antibiotics having compact but highly functionalized (and highly reactive) cyclopentane rings, is described. They key in this synthesis is the cyclization of 5b to 4b, by way of the intermediate alkylidene carbene.