作者:Kevin J. Quinn、Livio Islamaj、Shalise M. Couvertier、Kathleen E. Shanley、Brendan L. Mackinson
DOI:10.1002/ejoc.201000875
日期:2010.11
A convergent total synthesis of the mono(tetrahydrofuran) annonaceous acetogenin murisolin, with a longest linear sequence of nine steps, is reported. Assembly of the complete carbon framework by crossmetathesis and late-stage tetrahydrofuran formation on the intact backbone are key elements of the synthesis.
O-heterocyclization is applied as a key step in a total synthesis. This highly stereoselective and metal-free transformation introduces four stereocenters in one step. It was chosen to be the pivotal step in the synthesis of Murisolin and 16,19-cis-Murisolin, two annonaceousacetogenins. The efficiency of this synthesis is further illustrated by a stereodivergent late-stage separation of both synthetic routes
First total synthesis of murisolinElectronic Supplementary Information (ESI) available: characterization data of synthetic murisolin (1), and 1H and 13C NMR spectra of compounds 9, 12 and 1. See http://www.rsc.org/suppdata/cc/b3/b312362f/
The first and concise total synthesis of murisolin (1) was accomplished using asymmetric alkynylation and Sonogashira coupling as the key steps. The threo/trans/threo-type THF ring moiety was constructed with excellent stereoselectivity by asymmetric alkynylation of 1,6-heptadiyne to α-tetrahydrofuranic aldehyde, which was also prepared via the asymmetric alkynylation.
Total Synthesis of a 28-Member Stereoisomer Library of Murisolins
作者:Dennis P. Curran、Qisheng Zhang、Cyrille Richard、Hejun Lu、Venugopal Gudipati、Craig S. Wilcox
DOI:10.1021/ja061801q
日期:2006.7.1
library, fluorous PMB (p-methoxybenzyl) groups encode configurations, and fourmixtures of four dihydroxy-tetrahydrofurans are prepared by Shi epoxidation followed (optionally) by Mitsunobu reaction. The mixtures are coupled by Kocienski-Julia reaction with a single hydroxybutenolide followed by hydrogenation. Demixing and detagging provide the 16 pure stereoisomers. In the second synthesis, a single