Acyloxylactonisations mediated by lead tetracarboxylates
摘要:
The reaction of lead(IV) tetracarboxylates with carboxylic acids containing unsaturated side chains has been found to give acyloxy lactone products in a diastereoselective process; the reaction can be extended to lead(IV) tetrazolates to give the analogous outcome. Mechanistic implications of these results are discussed. (C) 2009 Elsevier Ltd. All rights reserved.
Interception of Criegee intermediate via tandem acetalization and fragmentation reaction provides a novel oxidative decarbonylation of malondialdehyde.
通过串联缩醛化和分解反应拦截Criegee中间体,提供了对丙二醛的新型氧化脱羰基化反应。
Acyloxylactonisations mediated by lead tetracarboxylates
作者:Ian F. Cottrell、Andrew R. Cowley、Laura J. Croft、Lauren Hymns、Mark G. Moloney、Ewan J. Nettleton、H. Kirsty Smithies、Amber L. Thompson
DOI:10.1016/j.tet.2009.01.042
日期:2009.3
The reaction of lead(IV) tetracarboxylates with carboxylic acids containing unsaturated side chains has been found to give acyloxy lactone products in a diastereoselective process; the reaction can be extended to lead(IV) tetrazolates to give the analogous outcome. Mechanistic implications of these results are discussed. (C) 2009 Elsevier Ltd. All rights reserved.
Catalytic Enantioselective Desymmetrization of Cyclobutane-1,3-diones by Carbonyl-Amine Condensation
A chiral phosphoric acid-catalyzed enantioselective condensation of 2,2-disubstituted cyclobutane-1,3-diones with a primary amine is described. This reaction offered a mild and efficient protocol for constructing quaternary carbon-containing cyclobutanes in good to high yields and enantioselectivities. This reaction is the first catalytic desymmetrizing carbonyl-amine condensation reaction and also