Terminal alkynes from aldehydes via dehydrohalogenation of (Z)-1-iodo-1-alkenes with TBAF
摘要:
Terminal alkynes were prepared in near quantitative yields via dehydrohalogenation of (Z)-1-iodo-1-alkenes with tetrabutylammonium fluoride (TBAF) under mild conditions. The methodology was expanded to include a one-pot, direct synthesis of terminal alkynes from aldehydes Without the necessity of isolating and purifying the intermediate iodoalkene. (C) 2008 Elsevier Ltd. All rights reserved.
Catalytic Intermolecular Carboamination of Unactivated Alkenes via Directed Aminopalladation
作者:Zhen Liu、Yanyan Wang、Zichen Wang、Tian Zeng、Peng Liu、Keary M. Engle
DOI:10.1021/jacs.7b06520
日期:2017.8.16
unactivated alkenes proceeding via a Pd(II)/Pd(IV) catalytic cycle has been developed. To realize this transformation, a cleavable bidentate directing group is used to control the regioselectivity of aminopalladation and stabilize the resulting organopalladium(II) intermediate, such that oxidative addition to a carbon electrophile outcompetes potential β-hydride elimination. Under the optimized reaction conditions
已开发出通过 Pd(II)/Pd(IV) 催化循环进行的未活化烯烃的分子间 1,2-碳甲化反应。为了实现这种转变,使用可裂解的双齿导向基团来控制氨基钯化的区域选择性并稳定所得的有机钯 (II) 中间体,从而使碳亲电子试剂的氧化加成胜过潜在的 β-氢化物消除。在优化的反应条件下,范围广泛的氮亲核试剂和碳亲电试剂是该反应中相容的偶联伙伴,提供中等至高产率。该反应的产物可以很容易地转化为游离的 γ-氨基酸和 γ-内酰胺,它们都是药物分子和生物活性化合物中常见的结构基序。
Modular Approach to the Synthesis of Unsaturated 1-Monoacyl Glycerols
作者:David J. Hart、Bridgett E. Coleman、Valerie Cwynar、Fabien Havas、Jakkam Madan Mohan、Suzanne Patterson、Sam Ridenour、Michael Schmidt、Eboney Smith、Angela J. Wells
DOI:10.1055/s-2004-825616
日期:——
A modular synthesis of unsaturated 1-monoacylglycerols (1) from cis-1-iodo-1-alkenes [cis-RCH=CHI] and unsaturated carboxylic acids [CH2=CH(CH2)nCO2H] is described. The method revolves around a Suzuki coupling to establish olefin geometry.
Iodoalkenes give symmetrical couplings to dienes with complete retention of configuration when treated with organolithium reagents in the presence of catalytic amounts of manganese(II) salts. A catalytic cycle is proposed through lithium manganate derivatives and manganese(IV) derivatives.