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.
Total Syntheses of Cladoacetals A and B: Confirmation of Absolute Configurations
作者:Day-Shin Hsu、Shih-Chung Lin
DOI:10.1021/jo300923e
日期:2012.7.20
The first enantioselective syntheses of cladoacetals A (1a, overall yield: 16%) and B (1b, overall yield: 34%) from crotonaldehyde in nine and seven steps, respectively, have been accomplished. Sharpless asymmetric dihydroxylation, Suzuki coupling, and acid-catalyzed intramolecular acetalization were the key steps in the syntheses. The absoluteconfiguration of natural (+)-cladoacetal A was affirmed
Synthesis of the C1−C13 Tetraenoate Subunit of the Chivosazoles
作者:Ian Paterson、S. B. Jennifer Kan、Lisa J. Gibson
DOI:10.1021/ol101630p
日期:2010.8.20
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.