Neutral amphiphiles of a new type corresponding to 1, 2-dialkylated mannitol ethers (6-10) were synthesized. Amephiphile-lipase aggregates were found to function as an immobilized enzyme system for enantioselective acetylation or enantioselective hydrolysis of α-hydroxy esters or α-acetoxy esters, respectively, in organic solvents.
Enantio‐ and Regioselective NiH‐Catalyzed Reductive Hydroarylation of Vinylarenes with Aryl Iodides
作者:Yuli He、Chuang Liu、Lei Yu、Shaolin Zhu
DOI:10.1002/anie.202010386
日期:2020.11.23
A highly enantio‐ and regioselectivehydroarylation process of vinylarenes with aryl halides has been developed using a NiH catalyst and a new chiral bis imidazoline ligand. A broad range of structurally diverse, enantioenriched 1,1‐diarylalkanes, a structure found in a number of biologically active molecules, have been obtained with excellent yields and enantioselectivities under extremely mild conditions
Organotitanium reagent generated from 1-t-butylthio-3-trimethylsilyl-1-propene condenses with aldehydes to give 1 -t-butylthio-(E,Z)-1,3-alkadienes in a single step via (E)-erythro-β-hydroxysilane in a highly regio- and stereoselective manner. 1,4-Dialkyl-1,3-diene is obtaind from the diene sulfide by cross coupling reaction with Grignard reagent in the presence of nickel catalyst. The utility of the
organic compounds with a trifluoromethyl group. A new and facile synthesis of ketones with a trifluoromethyl substituent in the α‐position proceeds through a one‐potphotoredox‐catalyzed trifluoromethylation–oxidation sequence of aromatic alkenes. Dimethyl sulfoxide (DMSO) serves as a key and mild oxidant under these photocatalytic conditions. Furthermore, an iridium photocatalyst, fac[Ir(ppy)3] (ppy=2‐phenylpyridine)