Chemoenzymatic synthesis of (R)- and (S)-1-heteroarylethanols
摘要:
A chemoenzymatic methodology for the synthesis of highly enantiomerically enriched (S)- and (R)-1-heteroarylethanols by enantioselective bioreduction with baker's yeast of the Corresponding 1-heteroarylethanones followed by three racemization free chemical steps including a Mitsunobu reaction was developed. (C) 2008 Elsevier Ltd. All rights reserved.
描述了手性氮原子上带有烷基取代基的金鸡纳生物碱衍生的 NN 配体的简明合成。含有新型手性 NN 配体和非手性膦的铱催化剂可有效地进行杂芳酮的不对称氢化,得到相应的醇,其 ee 高达 99.9%。相同的方案适用于α-氯杂芳基酮的不对称氢化。最重要的是,即使在1 MPa的H 2下,2-乙酰噻吩和2-乙酰呋喃的克级不对称氢化反应也能顺利进行。
Chiral Frustrated Lewis Pairs Catalyzed Highly Enantioselective Hydrosilylations of Ketones
作者:Xiaoqin Liu、Qiaotian Wang、Caifang Han、Xiangqing Feng、Haifeng Du
DOI:10.1002/cjoc.201900121
日期:2019.7
A highlyenantioselective Piers‐type hydrosilylation of simple ketones was successfully realized using a chiral frustrated Lewis pair of tri‐tert‐butylphosphine and chiral diene‐derived borane as catalyst. A wide range of optically active secondary alcohols were furnished in 80%—99% yields with 81%—97% ee's under mild reaction conditions.
Iminophenyl Oxazolinylphenylamine for Enantioselective Cobalt-Catalyzed Hydrosilylation of Aryl Ketones
作者:Xu Chen、Zhan Lu
DOI:10.1021/acs.orglett.6b02260
日期:2016.9.16
synthesized through three steps from commercially available starting materials. An efficient cobalt-catalyzed asymmetric hydrosilylation of simple ketones with a low catalyst loading of CoCl2 and IPOPA was developed to afford chiral alcohols in good yields with high enantioselectivities.
Tailored sol–gel immobilized lipase preparates for the enzymatic kinetic resolution of heteroaromatic alcohols in batch and continuous flow systems
作者:Mădălina Elena Moisă、Cristina Georgiana Spelmezan、Cristina Paul、Judith Hajnal Bartha-Vári、László Csaba Bencze、Florin Dan Irimie、Csaba Paizs、Fráncisc Péter、Monica Ioana Toşa
DOI:10.1039/c7ra10157k
日期:——
using various binary or ternary precursor mixtures for the EKR of various chiral heteroaromatic secondary alcohols with benzofuran, benzo[b]thiophen, phenothiazine and 2-phenylthiazol moieties. The operational stability in batch process was studied for five selected systems by performing reuse experiments, using the conversion, enantiomeric excesses and enantiomeric ratio as parameters, demonstrating
<i>ansa</i>-Ruthenium(II) Complexes of R<sub>2</sub>NSO<sub>2</sub>DPEN-(CH<sub>2</sub>)<sub>n</sub>(η<sup>6</sup>-Aryl) Conjugate Ligands for Asymmetric Transfer Hydrogenation of Aryl Ketones
作者:Andrea Kišić、Michel Stephan、Barbara Mohar
DOI:10.1002/adsc.201500288
日期:2015.8.10
New 3rd generation designer ansa‐ruthenium(II) complexes featuring N,C‐alkylene‐tethered N,N‐dialkylsulfamoyl‐DPEN/η6‐arene ligands, exhibited good catalytic performance in the asymmetric transfer hydrogenation (ATH) of various classes of (het)aryl ketones in formic acid/triethylamine mixture. In particular, benzo‐fused cyclic ketones furnished 98 to >99.9% ee using a low catalyst loading.
Visible‐Light‐Driven Catalytic Deracemization of Secondary Alcohols
作者:Zhikun Zhang、Xile Hu
DOI:10.1002/anie.202107570
日期:2021.10.11
Deracemization of racemic chiral compounds is an attractive approach in asymmetric synthesis, but its development has been hindered by energetic and kinetic challenges. Here we describe a catalytic deracemization method for secondary benzylic alcohols which are important synthetic intermediates and end products for many industries. Driven by visible light only, this method is based on sequential photochemical