Ring opening of cyclopropane in tricyclo[4.3.0.02,9]nonan-3-one with electrophile-nucleophile reagents
摘要:
Four tricyclo[4.3.0.0(2,9)]nonan-3-one systems were treated with TBDMSI, TMSTFA and TMSTFA/NaSPh, affording different cyclopropane cleavage products, depending on the location of the substituent and the nature of the reagent. (C) 1998 Elsevier Science Ltd. All rights reserved.
Ring opening of cyclopropane in tricyclo[4.3.0.02,9]nonan-3-one with electrophile-nucleophile reagents
摘要:
Four tricyclo[4.3.0.0(2,9)]nonan-3-one systems were treated with TBDMSI, TMSTFA and TMSTFA/NaSPh, affording different cyclopropane cleavage products, depending on the location of the substituent and the nature of the reagent. (C) 1998 Elsevier Science Ltd. All rights reserved.
Asymmetric Allylic Alkylation of Ketone Enolates: An Asymmetric Claisen Surrogate
作者:Erin C. Burger、Jon A. Tunge
DOI:10.1021/ol048149t
日期:2004.10.1
The combination of catalytic palladium(0) and Trost ligand provides an effective catalyst for the rearrangement of allyl beta-ketoesters. The mechanism of the transformation involves formation of pi-allyl palladium intermediates which undergo enantioselective attack by ketone enolates. Decarboxylation of beta-ketocarboxylates allows regiospecific generation of enolates under extremely mild conditions.