Catalytic Enantioselective Tandem Carbonyl Ylide Formation-Cycloaddition
摘要:
Catalytic enantioselective tandem carbonyl ylide formation-cycloaddition of alpha-diazo-beta-ketoesters 1 (R = alkyl, n = 1,2) using 1 mol% [Rh-2(S-DOSP)(4)] 2 in hexane at room temperature to give the cycloadducts 3 in good yields and up to 53% ee are described. (C) 1997 Elsevier Science Ltd.
Oxapolycycles from One-Pot Cross-Metathesis/Carbonyl Ylide Formation-Intramolecular Cycloaddition of α-Diazo-β-keto Esters
作者:David M. Hodgson、Deepshikha Angrish
DOI:10.1002/adsc.200600306
日期:2006.11
Chemoselective cross-metathesis of unsaturated α-diazo-β-ketoesters using Grubbs’ 2nd generation catalyst, followed by Rh2(OAc)4-catalysed tandem carbonylylideformation-intramolecularcycloaddition is demonstrated. The two different catalytic metallocarbene transfer reactions have also been successfully carried out in a one-pot procedure, which allows rapid generation of molecular complexity in