Regiochemistry of addition of aminoheterocycles to α-cyanocinnamonitriles: formation of aza-bridged bi- and tricycles
摘要:
The additions of various five-membered ring ammoheterocycles to alpha-cyanocinnamonitriles were studied. Regiochemistry of product formation can in most cases be controlled by choosing the appropriate electrophile. An mu-cyanocinnamonitrile with an additional P-leaving group normally provides products arising from initial attack of the ring amino group, while exo attack predominates in the case of the parent alpha-cyanocinnamonitrile. Aminopyrazole and aminoindazole provide only exo products with either electrophile. Product assignments were made via X-ray and 2D NMR methods; these assignments serve as a benchmark to several literature references and to future investigations of conjugate additions of these nucleophiles. (C) 2007 Elsevier Ltd. All rights reserved.
Vinylic Nonionic Substitutions of Ethyl (<i>E</i>)- and (<i>Z</i>)-3-Chloro-2-cyano-3-phenylpropenoate by Alcohols
作者:Lars F. Jalander
DOI:10.1080/00397919308013787
日期:1993.8
title compounds were prepared and the stereochemistry of the nonionic vinylic substitutions by methanol, ethanol, propanol, 2-propanol, and allylalcohol with ethyl (E)- and (Z)-3-chloro-2-cyano-3-phenylpropenoate (2 E,2 Z) in the presence of potassium carbonate, triethylamine and N-methyl-2-pyrrolidone were studied. The reactions with the alcohols gave ethyl (E)-3-alkoxy-2-cyano-3-phe- nylpropenoate