Fast and efficient one step synthesis of dienamides
作者:Jennifer E. Mathieson、James J. Crawford、Marc Schmidtmann、Rodolfo Marquez
DOI:10.1039/b901797f
日期:——
A fast and efficient one-step approach to the synthesis of dienamides is reported. This concise methodology relies on the use of imides as reactive intermediates and allows for the preferential formation of Z,E-dienamides in good yields.
structure--activity relationships of imidazolederivatives as inhibitors of thromboxane (TX) synthetase were investigated. Introduction of various substituents (e.g., one or two methyl groups, a halogen atom, a methylidene group, unsaturated bonds, or a phenylene group) into the alpha position or other positions in the carboxy-bearing side chain of 1-(7-carboxyheptyl)imidazole (15) was found to increase the
Total Synthesis of Phorboxazole A via <i>de Novo</i> Oxazole Formation: Strategy and Component Assembly
作者:Bo Wang、T. Matthew Hansen、Ting Wang、Dimao Wu、Lynn Weyer、Lu Ying、Mary M. Engler、Melissa Sanville、Christopher Leitheiser、Mathias Christmann、Yingtao Lu、Jiehao Chen、Nicholas Zunker、Russell D. Cink、Feryan Ahmed、Chi-Sing Lee、Craig J. Forsyth
DOI:10.1021/ja108906e
日期:2011.2.9
The phorboxazole natural products are among the most potent inhibitors of cancer cell division, but they are essentially unavailable from natural sources at present. Laboratory syntheses based upon tri-component fragment coupling strategies have been developed that provide phorboxazole A and analogues in a reliable manner and with unprecedented efficiency. This has been orchestrated to occur via the
佛盒唑天然产物是癌细胞分裂最有效的抑制剂之一,但目前基本上无法从天然来源获得。已经开发了基于三组分片段偶联策略的实验室合成,以可靠的方式和前所未有的效率提供佛盒唑 A 和类似物。这是通过从两个丝氨酸衍生的酰胺依次或同时形成天然产物的两个恶唑部分来进行的,包括氧化-环化脱水。已经开发了代表碳 3-17、18-30 和 31-46 的三种预组装组件的优化制备。本文详细介绍了这三个基本构建块的设计和综合。
Efficient Process for Preparing Steroids and Vitamin D Derivatives With the Unnatural Configuration at C20 (20 Alpha-Methyl) from Pregnenolone
申请人:Bridges Alexander James
公开号:US20080171728A1
公开(公告)日:2008-07-17
Disclosed herein are methods for preparing steroids and Vitamin D derivatives having the unnatural beta (usually S) configuration at C20, the methods comprising the use of compounds of the formula:
wherein R is as defined herein. Also disclosed are steroids and Vitamin D derivatives made using the methods disclosed herein and pharmaceutical compositions comprising said steroids and Vitamin D derivatives.
作者:Michael A. Schafroth、Stephan M. Rummelt、David Sarlah、Erick M. Carreira
DOI:10.1021/acs.orglett.7b01346
日期:2017.6.16
systems enabled through the combination of Lewis acid activation and iridium-catalyzedallylicsubstitution is described. The reaction proceeds with branched, allylic alcohols and carbon nucleophiles as well as heteronucleophiles to give a diverse set of ring systems in good yields and with high enantioselectivities. The utility of the method is highlighted by the asymmetric syntheses of erythrococcamides