[EN] PROCESS FOR THE PRODUCTION OF ASYMMETRIC EPOXIDES UNDER NON-AQUEOUS CONDITIONS AND CATALYTIC COMPOSITION FOR USE THEREIN [FR] PROCEDE DE PRODUCTION D'EPOXYDES ASYMETRIQUES DANS DES CONDITIONS NON AQUEUSES ET COMPOSITION CATALYTIQUE UTILISEE A CET EFFET
Asymmetric epoxidation of some arylalkenyl sulfones using a modified Juliá–Colonna procedure
作者:Jose-Maria Lopez-Pedrosa、Michael R. Pitts、Stanley M. Roberts、Shanthini Saminathan、John Whittall
DOI:10.1016/j.tetlet.2004.04.190
日期:2004.6
A modified procedure for performing the Juliá–Colonnaepoxidationreaction effects the oxidation of some vinyl sulfones to generate the corresponding epoxides 5–8 in good to excellent optical purity.
Stereoselective epoxidation of electron poor dienes using poly(L-leucine)
作者:Joanne V. Allen、Michael W. Cappi、Pierre D. Kary、Stanley M. Roberts、Natalie M. Williamson、L. Eduardo Wu
DOI:10.1039/a706238i
日期:——
Poly(L-leucine) catalysed oxidation of dienes 2, 3, 10, 16 and 18 and the triene 17 furnishes the corresponding epoxides 4, 5, 11, 19, 21 and 20 respectively in good to excellent yield and in states of high optical purity. Some regioselective reactions of the saturated epoxy ketones 5 and 11 are described.
properly activated by electron-withdrawing groups on both ends, are shown to be suitable substrates for phosphine-promoted organocatalytic processes. Their reactions with imines, under phosphine catalysis, afford a new and efficient synthetic approach to functionalized 3-pyrrolines.
Allen, Joanne V.; Bergeron, Sophie; Griffiths, Matthew J., Journal of the Chemical Society. Perkin transactions I, 1998, # 19, p. 3171 - 3179
作者:Allen, Joanne V.、Bergeron, Sophie、Griffiths, Matthew J.、Mukherjee, Shubhasish、Roberts, Stanley M.、Williamson, Natalie M.、Wu, L. Eduardo
DOI:——
日期:——
Coupling–Isomerization Synthesis of Chalcones
作者:Roland U. Braun、Markus Ansorge、Thomas J. J. Müller
DOI:10.1002/chem.200600530
日期:2006.12.4
coupling of electron-deficient (hetero)aryl halides 1 and (hetero)aryl or alkenyl 1-propargyl alcohols 2 does not terminate at the stage of the expected internal propargyl alcohols, but rather gives rise to the formation of alpha,beta-unsaturated ketones 3 with a variety of acceptor substituents. This new domino reaction, a coupling-isomerization reaction (CIR), can be rationalized as a sequence of