Efficient RhII binaphthol phosphate catalysts for enantioselective intramolecular tandem carbonyl ylide formation–cycloaddition of α-diazo-β-keto esters
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
One-pot cross-metathesis/tandem carbonyl ylide formation–intramolecular cycloaddition of an unsaturated 2-diazo-3,6-diketoester
作者:David M. Hodgson、Deepshikha Angrish、Agnès H. Labande
DOI:10.1039/b515943a
日期:——
Dicarbonyl-stabilised diazo functionality is tolerated during alkene cross-metathesis using Grubbs' catalyst, but undergoes subsequent tandem carbonylylideformation-intramolecular 1,3-dipolar cycloaddition on addition of catalytic Rh2(OAc)4 in a one-pot operation.
Synthesis and evaluation of 4,4′,6,6′-tetrasubstituted binaphtholphosphate dirhodium(II) complexes as catalysts in enantioselective carbonyl ylide formation–cycloaddition reactions
作者:David M. Hodgson、Deborah A. Selden、Alexander G. Dossetter
DOI:10.1016/j.tetasy.2003.09.029
日期:2003.12
The synthesis of tetrakis[4,4′,6,6′-tetrasubstituted-1,1′-bi-2-naphtholphosphate]dirhodium(II) complexes, and their use as catalysts in the enantioselective tandem carbonylylide formation–intramolecular 1,3-dipolar cycloaddition of an unsaturated 2-diazo-3,6-diketoester, generating cycloadduct in up to 86% ee, is described.
Catalytic Enantioselective Tandem Carbonyl Ylide Formation-Cycloaddition
作者:David M. Hodgson、Paul A. Stupple、Craig Johnstone
DOI:10.1016/s0040-4039(97)01480-9
日期:1997.9
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.
Efficient RhII binaphthol phosphate catalysts for enantioselective intramolecular tandem carbonyl ylide formation–cycloaddition of α-diazo-β-keto esters
作者:David M. Hodgson、Paul A. Stupple、Craig Johnstone
DOI:10.1039/a906787f
日期:——
Catalytic enantioselective tandem carbonyl ylide formationâcycloadditions of α-diazo-β-keto ester 1 using 0.5 mol% dirhodium tetrakis(1,1â²-binaphthyl-2,2â²-diyl phosphate) catalysts 7â9 and 14 to give the cycloadduct 3 in good yields and up to 90% ee are described.