New chiral acetate imide enolate for stereoselective aldol reactions
作者:Claudio Palomo、Mikel Oiarbide、Alberto González、Jesús M. García、Fabienne Berrée、Anthony Linden
DOI:10.1016/0040-4039(96)01520-1
日期:1996.9
The chiral imide acetate 4 reacts upon lithium and titanium enolate formation conditions with aldehydes in a stereoselective manner. Remarkably, aldols obtained from aromatic and α,β-unsaturated aldehydes exhibited opposite stereochemistry than those obtained from aliphatic aldehydes.
The Mechanism of Dehydrating Bimodules in
<i>trans</i>
‐Acyltransferase Polyketide Biosynthesis: A Showcase Study on Hepatoprotective Hangtaimycin
作者:Minghe Luo、Houchao Xu、Yulu Dong、Kun Shen、Junlei Lu、Zhiyong Yin、Miaomiao Qi、Guo Sun、Lingjie Tang、Jin Xiang、Zixin Deng、Jeroen S. Dickschat、Yuhui Sun
DOI:10.1002/anie.202106250
日期:2021.8.23
enzyme contains an internal dehydratingbimodule, which is usually found split in other trans-AT PKSs. The mechanisms of such dehydratingbimodules have often been proposed, but have never been deeply investigated. Here we present in vivo mutations and in vitro enzymatic experiments that give first and detailed mechanistic insights into catalysis by dehydratingbimodules.
The substrate scope of dehydratases in antibiotic biosynthesis and their application in kinetic resolutions
作者:Zhiyong Yin、Daniel Bär、Bertolt Gust、Jeroen S. Dickschat
DOI:10.1039/d2ob01879a
日期:——
The dehydratase BorDH2 from borrelidin biosynthesis was found to have a wide substrate tolerance in the dehydration of 3D alcohols and was applied in kinetic resolutions.
The camphor-derived N-acetyloxazolidinethione has been used to effect enantioselective aldol type reactions of the derived 9-BBN enolate with a variety of aldehydes. Mechanistically, the observed facial selectivity is best explained by a boatlike transition structure.
A New Approach for the Chemoselective Debromination of Chiral Bromohydrins. Toward the Development of a Very General Approach to Enantiopure α-Unsubstituted β-Hydroxy Acids