converting enzyme (ECE) inhibitors and potential antihypertensive agents, is reported featuring a key cross-metathesis between a vinyl-functionalizedthiazole and a terminal olefin. As the two natural products only differ by the nature of their hydroxyalkyl side-chain, our convergent strategy enable the synthesis of key intermediates of both molecules in a limited amount of steps.
Novel analogs of epothilone A, epothilone B, and epothilone C are synthesized by Stille coupling thazole-stannanes to macrolactone intermediates. The synthetic epothilone analogs selectively prevent mitosis in cancer cells through the induction and stabilization of microtubulin assembly. Selected synthetic epothilone analogs are demonstrated to have greater bioactivity than their corresponding native compound.
A base-catalyzed approach for the anti-Markovnikov hydration of styrene derivatives
作者:Spencer P. Pajk、Zisong Qi、Stephen J. Sujansky、Jeffrey S. Bandar
DOI:10.1039/d2sc02827a
日期:——
The base-catalyzed addition of 1-cyclopropylethanol to styrene derivatives with an acidic reaction workup enables anti-Markovnikov hydration. The use of either catalytic organic superbase or crown ether-ligated inorganic base permits hydration of a wide variety of styrene derivatives, including electron-deficient, ortho-substituted and heteroaryl variants. This protocol complements alternative routes
Total synthesis of Epothilone E and related side-chain modified analogues via a stille coupling based strategy1This paper is dedicated with admiration and respect to the memory of Sir Derek H. R. Barton.1
A Stille couplingstrategy has been utilized to complete a totalsynthesis of epothilone E from vinyl iodide 7 and thiazole-stannane 8h. The central core fragment 7 and its trans-isomer 11 were prepared from triene 15 using ring-closing metathesis (RCM), and were subsequently coupled to a variety of alternative stannanes to provide a library of epothilone analogues 18a-o and 19a-o. The Stille coupling