[EN] NOVEL PHOSPHOROUS (V)-BASED REAGENTS, PROCESSES FOR THE PREPARATION THEREOF, AND THEIR USE IN MAKING STEREO-DEFINED ORGANOPHOSHOROUS (V) COMPOUNDS [FR] NOUVEAUX RÉACTIFS À BASE DE PHOSPHORE (V), LEURS PROCÉDÉS DE PRÉPARATION ET LEUR UTILISATION DANS LA FABRICATION DE COMPOSÉS ORGANOPHOSHOREUX (V) STÉRÉODÉFINIS
Effect of Microwaves in the Chiral Switching Asymmetric Michael Reaction
作者:S. Narasimhan、S. Velmathi
DOI:10.3390/80200256
日期:——
HighlyenantioselectiveMichael reactions of malonates with cyclic enones are achieved in remarkably less time under microwave irradiation using newly developed heterobimetallic catalysts.
Michael Addition Reaction of Thioacetic Acid (AcSH) to Conjugated Alkenes Under Solvent- and Catalyst-Free Conditions
作者:Sara Sobhani、Soodabeh Rezazadeh
DOI:10.1080/10426500903496713
日期:2010.9.27
A new and convenient procedure has been developed for the Michael addition reaction of thioaceticacid (AcSH) to a variety of conjugated alkenes under solvent- and catalyst-free conditions. These reactions proceeded in 5–60 min and produced the desired products in good to high yields.
Organocatalytic enantioselective Michael addition of thioacetic acid to enones
作者:Hao Li、Liansuo Zu、Jian Wang、Wei Wang
DOI:10.1016/j.tetlet.2006.02.140
日期:2006.5
An enantioselective, organocatalyticMichaeladdition reaction of thioacetic acid with enones has been developed. The process, catalyzed by a chiral bifunctional amine thiourea, furnishes products in excellent yields with up to 63% ee.
Novel heterobimetallic catalysts for asymmetric Michael reactions
作者:S Velmathi、S Swarnalakshmi、S Narasimhan
DOI:10.1016/s0957-4166(02)00737-1
日期:2003.1
The newly developed chiral catalysts 1 and 2 show opposite enantioselectivity in Michael addition reactions of cyclic enones and malonates resulting in the production of both enantiomers of products in good chemical yield and enantiomeric excess. Al-27 NMR studies showed the formation of different types of complexes for catalysts 1 and 2 and the enantioselectivity was found to be dependent on the nature of the aluminium complex formed. Scope of the reaction was extended to other Michael donors such as nitro alkanes and thiols. (C) 2003 Elsevier Science Ltd. All rights reserved.