Catalysis of Diels-Alder reactions by metalloporphyrins
作者:David W. Bartley、Thomas J. Kodadek
DOI:10.1016/s0040-4039(00)97048-5
日期:1990.1
Aluminium (111) tetraphenyl porphyrin chloride (AITPPCl) has been shown to catalyze Diels-Alder reactions of α,β-unsaturated carbonyl compounds in moderate yield. Selectivity based on electronic effects is exhibited which is different from that seen with catalysts such as diethylaluminlum chloride.
[AlCl<sub>3</sub> + 2THF]: A New and Efficient Catalytic System for Diels−Alder Cycloaddition of α,β-Unsaturated Carbonyl Compounds under Solvent-Free Conditions
[AlCl(3) + 2THF] is a newcatalytic system for the Diels-Aldercycloaddition under SFC and air atmosphere. By using equimolar amounts of reactants, this catalyst prevents the polymerization of the diene and allows the corresponding adducts to be isolated with high regio- and stereocontrol and in excellent yields. [reaction: see text]
We have developed a catalytic protocol for Diels-Alder reaction using trialkylphosphonium oxoborates as oxyanion hole catalysts. The reaction can be operated under ambient conditions. Dienes could easily polymerize under acidic condition. Nonetheless, these acid-sensitivesubstrates are compatible with the catalytic protocol and the reaction scope covers a wide range of substrates.
Indium trichloride: a useful catalyst for ionic Diels–Alder reactions
作者:B.Gopal Reddy、R Kumareswaran、Y.D Vankar
DOI:10.1016/s0040-4039(00)01857-8
日期:2000.12
Indium trichloride (20 mol%) in nitromethane permits ionic Diels-Alder reaction of a variety of 2,3-olefinic acetals to form the corresponding cycloadducts in good yields with good endo selectivities. (C) 2000 Elsevier Science Ltd. All rights reserved.
ENANTIOSELECTIVE TRANSFORMATION OF ALFA,BETA-UNSATURATED KETONES USING CHIRAL ORGANIC CATALYSTS