Conjugated imines and iminium salts as versatile acceptors of nucleophiles
作者:Makoto Shimizu、Iwao Hachiya、Isao Mizota
DOI:10.1039/b814930e
日期:——
development of synthetic methodologies where nucleophilicaddition reactions to imino carbons are utilized in crucial steps. This article summarizes double nucleophilicaddition reactions with alpha,beta-unsaturated aldimines, addition reactions using alkynyl imines, "umpoled" reactions of alpha-imino esters, and the use of iminium salts as reactive electrophiles.
Ring-Expansion Reaction of Cyclic β-Keto Esters or α-Cyano Ketones via Conjugate Addition to Alkynyl Imines: The Synthesis of Functionalized Medium-Sized Carbocycles
The ring-expansion reaction of cyclic β-keto esters or α-cyano ketones afforded two-atom-enlarged carbocyclic products in good yields via conjugateaddition to alkynyl imines. On the other hand, the reaction of ethyl 2-oxocyclododecanecarboxylate with alkynyl imine proceeded smoothly to give bicyclo-2-pyridone in moderate yield.
Enantioselective Michael Reaction of Cyclic β-Ketoesters with Morita–Baylis–Hillman Derivatives Using a Phase-Transfer Catalyst
作者:Ryukichi Takagi、Emi Fujii、Hirotoshi Kondo
DOI:10.1021/acs.joc.8b01777
日期:2018.9.21
enantioselective Michael reaction of cyclic β-ketoesters with Morita–Baylis–Hillman (MBH) derivatives using a phase-transfercatalyst. Cyclic β-ketoesters reacted with MBH derivatives to stereoselectively generate a quaternary carbon center in the presence of cinchona alkaloid-derived bulky ammonium catalyst, and aqueous KOH and Michael adducts bearing an acrylate moiety were obtained in good chemical yields
Hiong, Annales de Chimie (Cachan, France), 1942, vol. <11>17, p. 269,299,300
作者:Hiong
DOI:——
日期:——
Physically mixed catalytic system of amino and sulfo-functional porous organic polymers as efficiently synergistic co-catalysts for one-pot cascade reactions
or alkaline treatment. The bi-functional polymeric materials were utilized as a synergistic catalytic system for one-potcascadereactions including deacetalization–Henry condensation reaction, deacetalization–Knoevenagel condensation reaction and the transformation of 3,4-dihydropyran derivatives to α-ester cyclohexenone compounds. The crosslinked polymeric frameworks effectively isolated sulfonic