Total Syntheses of Scaparvins B, C, and D Enabled by a Key C–H Functionalization
作者:Qinda Ye、Pei Qu、Scott A. Snyder
DOI:10.1021/jacs.7b06185
日期:2017.12.27
possesses an impressive range of bioactivities and high synthetic challenge due to their unique amalgamation of rings, stereocenters, and oxygenation. Herein, we disclose the first totalsyntheses of three members, scaparvins B, C, and D, through a route fueled by several chemoselective and carefully orchestrated steps. One such operation is a tailored late-stage C-H functionalization converting a carboxylic
由于环、立体中心和氧合的独特融合,克莱罗丹二萜家族具有一系列令人印象深刻的生物活性和高合成挑战。在这里,我们公开了三个成员,scaparvins B、C 和 D 的第一次全合成,通过几个化学选择性和精心策划的步骤推动的路线。一种这样的操作是在最小化烯烃环氧化的条件下通过叔CH键的氧化将羧酸转化为内酯的定制后期CH官能化。这一步提供了完成目标的关键功能。此外,使用适当的手性催化剂与拉瓦尔二烯使序列具有对映选择性。
γ-lactones from δ-lactones: total synthesis of the biosynthetic derailment product mupirocin H
作者:Robert W. Scott、Carlo Mazzetti、Thomas J. Simpson、Christine L. Willis
DOI:10.1039/c2cc17721h
日期:——
Two different strategies for the synthesis of functionalised γ-lactones from δ-lactones are described and used in a convergent synthesis of (+)-mupirocin H. The total synthesis is versatile and may be readily adapted for the preparation of further truncated metabolites from Pseudomonas fluorescens.
Synthesis of Tetrathiafulvalene Derivatives by the Use of Organoaluminium Reagents
作者:Takehiko Mori、Hiroo Inokuchi
DOI:10.1246/cl.1992.1873
日期:1992.9
Bis(dimethylaluminium) salts of ethanedithiol, 1,2-benzenedithiol, and ethylenedithiol react with 1,3-dithiolane-2-carboxylate esters to give dihydro- and tetrahydro-tetrathiafulvalenes as well as tetrathiafulvalenederivatives.
In the presence of a catalytic amount of trityl salt, allylstannanes and stannylated enolates smoothly react with 2-(2-ethylthioalkylidene)-1,3-dithiolane, synthetic equivalent of α,β-unsaturated ester, to afford the corresponding adducts in good yields, respectively.