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.
Baker’s yeast-mediated synthesis of (R)- and (S)-heteroaryl-ethane-1,2-diols
作者:Paula Veronica Podea、Csaba Paizs、Monica Ioana Toşa、Florin Dan Irimie
DOI:10.1016/j.tetasy.2008.07.030
日期:2008.8
Baker’s yeast-mediated enantioselective bioreduction of 1-(heteroaryl)-2-hydroxyethanones and 2-acetoxy-1-(hetero-aryl)ethanones was used for the enantioselective synthesis of both (R)- and (S)-benzofuranyl-, benzo[b]thiophenyl- and benzo[d]thiazolyl-ethane-1,2-diols.
贝克的酵母介导的1-(杂芳基)-2-羟基乙酮和2-乙酰氧基-1-(杂芳基)乙酮的对映选择性生物还原被用于(R)-和(S)-苯并呋喃基-苯并的对映选择性合成。[ b ]硫代苯基-和苯并[ d ]噻唑基乙烷-1,2-二醇。
Facile Development of Chiral Alkenylboranes from Chiral Diynes for Asymmetric Hydrogenation of Silyl Enol Ethers
作者:Xiaoyu Ren、Gen Li、Simin Wei、Haifeng Du
DOI:10.1021/acs.orglett.5b00085
日期:2015.2.20
A facile development of chiral alkenylboranes by the hydroboration of chiral diynes with Piers’ borane was successfully achieved for the first time. With the combination of the in situ generated chiral alkenylboranes and tri-tert-butylphosphine as frustrated Lewis pair catalysts, the metal-free asymmetric hydrogenation of silylenolethers was realized to furnish a wide range of optically active secondary
Lipase and sulfuric acid were combined to achieve the dynamickineticresolution (DKR) of sec-alcohols. Concomitant use of these inherently incompatible catalysts was achieved via phase separation in a Pickering emulsion. Racemization in an acidic aqueous phase significantly suppressed the dehydrative side reactions that form alkenes and dimeric ethers, which are often encountered under DKR conditions