by limited access to appropriate substrate surrogates. We present a step-economic synthetic access to biomimetic β-ketopolyene thioesters that is based on an Ir-catalyzed reductive Horner–Wadsworth–Emmonsolefination. New β-ketotriene and pentaenethioates of pantetheine and N-acetylcysteamine were exemplarily synthesized via short and concise routes. The usefulness of these compounds was demonstrated
Total Synthesis of (−)-Tirandamycin C Utilizing a Desymmetrization Protocol
作者:J. S. Yadav、Santu Dhara、Sk. Samad Hossain、Debendra K. Mohapatra
DOI:10.1021/jo3016709
日期:2012.11.2
A highly stereoselective total synthesis of (−)-tirandamycin C has been achieved following a desymmetrization protocol developed in our group, Horner–Wadsworth–Emmonsolefination, acid-catalyzed ketalization, Still–Gennari (Z)-selectiveolefination, and Dieckmann cyclization as key reactions.
A flexible synthetic route to the 16-membered tetramate-embedding macrocyclic scaffold present in various polycyclic tetramate macrolactams (PTMs) was developed which differs from the seminal synthesis of ikarugamycin by Boeckman Jr. in protecting groups and the order of connections. We also devised a short approach to various stereoisomers of the 5/5/6-tricarbocyclic motif found in discodermide and
Toward the total synthesis of lophotoxin — New methodologies and synthetic strategies
作者:Peter Wipf、Michel Grenon
DOI:10.1139/v06-073
日期:2006.10.1
progress toward the synthesis of the furanocembranolide lophotoxin (1) is disclosed. Strategies for the stereoselective incorporation of the C13 stereocenter by a catalytic desymmetrization of a cyclic meso-anhydride, as well as a novel 1,6-addition reaction of organocuprates to unsaturated [1,3]dioxin-4-ones are discussed. Preliminary results on the development of a rhodium-catalyzed asymmetric 1,6-addition
A reasonable synthesis design by strategically integrating functional group manipulation into the ring system construction resulted in a short, enantioselective, gram-scale total synthesis of (−)-zephyranthine. The concise route includes a catalytic Michael/Michael cascade for the asymmetric synthesis of a penta-substituted cyclohexane with three contiguous stereogenic centers, a remarkable 8-step
通过将官能团操作战略性地整合到环系统构建中,合理的合成设计导致 (-)-zephyranthine 的短、对映选择性、克级全合成。简洁的路线包括催化迈克尔/迈克尔级联,用于不对称合成具有三个连续立体中心的五取代环己烷,一个显着的 8 步一锅操作轻松组装 zephyranthine 四环骨架,双键的区域选择性构建在 C 环和不对称二羟基化。这种合成也很灵活,为各种环己胺稠合的三环或多环生物碱铺平了潜在的途径。