作者:Fraser F. Fleming、Venugopal Gudipati、Omar W. Steward
DOI:10.1021/ol017286c
日期:2002.2.1
[reaction: see text] Chelation between gamma-hydroxybutynenitrile and Grignard reagents triggers a particularly facile anionic conjugate addition reaction. Structurally diverse Grignard reagents add with equal efficiency, providing an intermediate anion that stereoselectively alkylates benzaldehyde in an overall addition-alkylation reaction.
作者:Fraser F. Fleming、Venugopal Gudipati、Omar W. Steward
DOI:10.1016/s0040-4020(03)00765-8
日期:2003.7
Chelation-controlled conjugate addition of Grignard reagents to γ-hydroxyalkynenitriles stereoselectively generates tri- and tetra-substituted alkenenitriles. t-BuMgCl-initiated deprotonation of hydroxyalkynenitriles followed by addition of a second Grignard reagents triggers a facile conjugate addition leading to a cyclic magnesium chelate. Protonation of the chelate stereoselectively generates trisubstituted
作者:Fraser F. Fleming、Qunzhao Wang、Zhiyu Zhang、Omar W. Steward
DOI:10.1021/jo0258150
日期:2002.8.1
Grignard and organolithium reagents to gamma-hydroxy-alpha,beta-alkenenitriles promotes efficient conjugateadditions to what are otherwise recalcitrant Michael acceptors. Sequential deprotonation and addition of a modest excess of a second Grignard reagent allows effective conjugate delivery of alkyl groups to cyclic and acyclic alkenenitriles. Mechanistically, conjugateadditions proceed through alkylmagnesium
Chemoselective Palladium-Catalyzed Cyanation of Alkenyl Halides
作者:Kimberley J. Powell、Li-Chen Han、Pallavi Sharma、John E. Moses
DOI:10.1021/ol500618w
日期:2014.4.18
A palladium-catalyzed cyanation of alkenyl halides using acetone cyanohydrin is described. A number of structurally diverse alkenylic nitrile containing compounds was prepared in one step under optimized conditions. The reaction proved to be efficient, chemoselective, easy to perform, and tolerant of a number of functional groups.
Convenient procedure of Horner–Wadsworth–Emmons olefination for the synthesis of simple and functionalized α,β-unsaturated nitriles
作者:Alessandra Lattanzi、Liliana R. Orelli、Patrizia Barone、Antonio Massa、Patrizia Iannece、Arrigo Scettri
DOI:10.1016/s0040-4039(02)02880-0
日期:2003.2
A mild and practical procedure of Horner-Wadsworth-Emmons olefination promoted by lithium hydroxide and alpha-cyano phosphonates has been set up for the synthesis of alpha,beta-unsaturated nitrites. The reaction conditions are tolerated by functionalized ketones and the exclusive formation of E-gamma-hydroxy alpha,beta-unsaturated nitrites has been observed. (C) 2003 Elsevier Science Ltd. All rights reserved.