Stereoselective Olefination of N-Sulfonyl Imines with Stabilized Phosphonium Ylides for the Synthesis of Electron-Deficient Alkenes
作者:Fan Fang、Yuan Li、Shi-Kai Tian
DOI:10.1002/ejoc.201001379
日期:2011.2
alkenes in moderate to excellent yields from readily accessible N-sulfonyl imines and stabilized phosphoniumylides. Significantly, the olefination reaction of N-sulfonylimines with nitrile-stabilized phosphoniumylides affords an array of α,β-unsaturated nitriles with high Z selectivity, and the reactions with ester-, amide-, and ketone-stabilized phosphoniumylides afford α,β-unsaturated esters, amides
已经开发了一种前所未有的方案,用于从易于获得的 N-磺酰基亚胺和稳定的鏻叶立德以中等至优异的产率立体选择性合成结构多样的缺电子烯烃。值得注意的是,N-磺酰亚胺与腈稳定的鏻叶立德的烯化反应提供了一系列具有高 Z 选择性的 α,β-不饱和腈,并且与酯、酰胺和酮稳定的鏻叶立德的反应提供了 α,β -分别具有高 E 选择性的不饱和酯、酰胺和酮。反应混合物的光谱分析和中间体的捕获允许提出合理的机制。初始亚胺/叶立德加成导致形成环化形成 1 的甜菜碱,2-氮杂膦烷随后消除亚氨基膦以产生烯烃。对于缺电子的 1,2-二取代烯烃的合成,甜菜碱中吸电子基团的存在允许通过质子转移在其两种非对映异构体之间快速相互转化。烯烃合成的 Z/E 选择性由两种甜菜碱非对映异构体形成相应的 1,2-氮杂膦非对映异构体的不同速率决定。相比之下,合成缺电子三取代烯烃的 Z/E 选择性源于稳定的鏻叶立德与 N-磺酰基亚胺的非对映选
Versatile O- and S-functionalized 1,2,3-triazoliums: ionic liquids for the Baylis–Hillman reaction and ligand precursors for stable MIC-transition metal complexes
作者:Daniel Mendoza-Espinosa、Rodrigo González-Olvera、Cecilia Osornio、Guillermo E. Negrón-Silva、Rosa Santillan
DOI:10.1039/c4nj02076f
日期:——
A series of O- and S-functionalized triazolium salts display high performance in the Baylis–Hillman addition and allow the one-pot formation of MIC-transition metal complexes.
Synthesis of 1,3-Dialkyl-1,2,3-triazolium Ionic Liquids and Their Applications to the Baylis−Hillman Reaction
作者:Yunkyung Jeong、Jae-Sang Ryu
DOI:10.1021/jo100618d
日期:2010.6.18
Novel 1,3-dialkyl-1,2,3-triazolium ionic liquids were synthesized via click reactions using 1-trimethylsilylacetylene and alkyl azides and were efficient reaction media for the Baylis−Hillman reaction. The problems associated with deprotonation of the C-2 hydrogen of [bmim][PF6] could be suppressed in the reaction of [bmTr][PF6] or [bmTr][NTf2]. 1,3-Dialkyl-1,2,3-triazolium ionic liquids are chemically
Antimalarial activity of 3-hydroxyalkyl-2-methylene-propionic acid derivatives
作者:Mrinal K. Kundu、N. Sundar、Srinivas K. Kumar、Sujata V. Bhat、Sukla Biswas、Neena Valecha
DOI:10.1016/s0960-894x(99)00057-8
日期:1999.3
Several Baylis-Hillman adducts and their derivatives were synthesized and evaluated as targeted potential anti-malarials, The compounds 4, 7 and 9 were found to have highest potency against P. falciparum in vitro. The in vivo test result of compound 4 and 9 against P. berghei demonstrated activity at 80 mg/Kg dose level. (C) 1999 Elsevier Science Ltd. All rights reserved.