Highly Regio- and Enantioselective Monoepoxidation of Conjugated Dienes
作者:Michael Frohn、Molly Dalkiewicz、Yong Tu、Zhi-Xian Wang、Yian Shi
DOI:10.1021/jo9721195
日期:1998.5.1
This paper describes a highly effective and mild asymmetric monoepoxidation method for conjugated dienes using a fructose-derived chiral ketone 1 as catalyst and Oxone as oxidant. The regioselectivies and enantioslectivies are very high in most cases. For unsymmetrical dienes, the regioselectivity can be regulated by using steric and electronic control. The olefin substrates include trans-disubstituted and trisubstituted olefins that can bear a wide range of functional groups such as hydroxyl groups, TBS ethers, or esters. The enantiomeric excesses for the major monoepoxides range from 89% to 97%. The epoxidation is believed to proceed via a spiro mode.
HUANG, YAO-ZENG;CHEN, CHEN;SHEN, YANCHANG, J. ORGANOMET. CHEM., 366,(1989) N-2, C. 87-93
作者:HUANG, YAO-ZENG、CHEN, CHEN、SHEN, YANCHANG
DOI:——
日期:——
[EN] PRODUCTION OF MYXOPYRONIN AND OF ITS DERIVATIVES<br/>[FR] PRODUCTION DE MYXOPYRONINE ET DE SES DÉRIVÉS
申请人:HELMHOLTZ ZENTRUM FÜR INFEKTIONSFORSCHUNG GMBH
公开号:WO2014181000A1
公开(公告)日:2014-11-13
The invention provides a process for producing myxopyronin and derivatives of myxopyronin by providing synthetic pathway enzymes in a microorganism or in vitro, e.g. extracellularly. Myxopyronin and derivatives of myxopyronin in the second embodiment can be produced by cultivating a microorganism expressing at least partially modified enzymes which are modified e.g. by inactivation and/or change of activity of at least one enzyme of the enzymes and/or of at least one domain of one of these enzymes and/or of at least one catalytic center of one of these domains.Further, a precursor compound can be added to a microorganism expressing the synthetic pathway enzymes in which at least one catalytic domain is inactivated.
Synthetic Variants of Mycolactone Bind and Activate Wiskott–Aldrich Syndrome Proteins
Mycolactone is a complex macrolide toxin produced by Mycobacterium ulcerans, the causative agent of skin lesions called Buruliulcers. Mycolactone-mediated activation of neural (N) Wiskott–Aldrich syndrome proteins (WASP) induces defects in cell adhesion underpinning cytotoxicity and disease pathogenesis. We describe the chemical synthesis of 23 novel mycolactoneanalogues that differ in structure