The Substrate Spectrum of Mandelate Racemase: Minimum Structural Requirements for Substrates and Substrate Model
作者:Ulfried Felfer、Marian Goriup、Marion F. Koegl、Ulrike Wagner、Barbara Larissegger-Schnell、Kurt Faber、Wolfgang Kroutil
DOI:10.1002/adsc.200505012
日期:2005.6
This review summarizes all aspects of mandelateracemase relevant for the application of this enzyme in preparative-scale biotransformations with special emphasis on its substrate tolerance. Collection and evaluation of substrate structure-activity data led to a set of general guidelines, which were used as basis for the construction of a general substratemodel, which allows a quick estimation of the
Synthesis of 6-Hydroxysphingosine and α-Hydroxy Ceramide Using a Cross-Metathesis Strategy
作者:Patrick Wisse、Mark A. R. de Geus、Gen Cross、Adrianus M. C. H. van den Nieuwendijk、Eva J. van Rooden、Richard J. B. H. N. van den Berg、Johannes M. F. G. Aerts、Gijsbert A. van der Marel、Jeroen D. C. Codée、Herman S. Overkleeft
DOI:10.1021/acs.joc.5b00823
日期:2015.7.17
In this paper, a new synthetic route toward 6-hydroxysphingosine and alpha-hydroxy ceramide is described. The synthesis employs a cross-metathesis to unite a sphingosine head allylic alcohol with a long-chain fatty acid alkene that also bears an allylic alcohol group. To allow for a productive CM coupling, the sphingosine head allylic alcohol was protected with a cyclic carbonate moiety and a reactive CM catalyst system, consisting of Grubbs II catalyst and CuI, was employed.
Warmerdam; Van Den Nieuwendijk; Kruse, Recueil des Travaux Chimiques des Pays-Bas, 1996, vol. 115, # 1, p. 20 - 24
作者:Warmerdam、Van Den Nieuwendijk、Kruse、Brussee、Van Der Gen
DOI:——
日期:——
The first case of asymmetric induction in intramolecular nitrile imine cycloadditions: synthesis of enantiopure 3-substituted 6-oxo-2,3,3a,5-tetrahydro-4-carbomethoxy-furo[3,4-c]pyrazoles
Intramolecular cycloaddition of homochiral nitrile imines 5, generated in situ from base treatment of the corresponding hydrazonoyl chlorides 4, involves diastereoselective formation of the title compounds in the enantiomerically pure form. (C) 1999 Elsevier Science Ltd. All rights reserved.
Asymmetric epoxidation of chiral allylic alcohols
作者:Erwin G.J.C. Warmerdam、Adrianus M.C.H. van den Nieuwendijk、Johannes Brussee、Chris G. Kruse、Arne van der Gen
DOI:10.1016/0957-4166(96)00327-8
日期:1996.9
Two series of chiral allylic alcohols, derived from alpha,beta-unsaturated cyanohydrins, were subjected to asymmetric epoxidation under a variety of conditions. Both achiral (organic peracid, metal-catalyzed peroxide) and chiral (Sharpless titanium-tartrate system) oxidants were applied. Several three and all theoretically possible erythro epoxides were isolated in enantiomerically and diastereomerically pure form. Copyright (C) 1996 Elsevier Science Ltd