Enzymatic resolution of chroman-4-ol and its core analogues with Burkholderia cepacia lipase
作者:Olexandr V. Kucher、Anastasiya O. Kolodyazhnaya、Oleg B. Smolii、Alexandr I. Boiko、Vladimir S. Kubyshkin、Pavel K. Mykhailiuk、Andrey A. Tolmachev
DOI:10.1016/j.tetasy.2014.02.010
日期:2014.4
A convenient protocol for lipase resolution of chroman-4-ol and its analogues (six- and seven-membered rings with O, S, SO2) has been elaborated. The structure of substrates has minor influence on the efficiency of resolution. (C) 2014 Elsevier Ltd. All rights reserved.
Asymmetric Hydrogenation of Aromatic Heterocyclic Ketones Catalyzed by the MsDPEN–Cp*Ir(III) Complex
Asymmetric hydrogenation of aromatic heterocyclic ketones catalyzed by Cp*Ir(OTf)(Msdpen) (MsDPEN = N-(methanesulfonyl)-1,2-diphenylethylenediamine) affords the heterocyclic alcohols in 93% to >99% ee. The reaction is conducted in a methanolic solution with a substrate-to-catalyst molar ratio of 200-5000 under 15 atm of H-2. The heterocyclic rings of substrates are left intact.
<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.