Chemoselective reduction of ketones: trifluoromethylketones versus methylketones
摘要:
Treatment of an equimolar mixture of trifluoromethylketones (TFMKs) and methylketones (MKs) with Et2Zn resulted in selective reduction of the TFMKs in good yield. In contrast, treatment of an equimolar mixture of TFMKs and MKs with NaBH4 in the presence of CeCl3 in EtOH/H2O (10:1) at -10degreesC reduced only the MKs. (C) 2005 Elsevier Ltd. All rights reserved.
Dynamic Kinetic Cross-Electrophile Arylation of Benzyl Alcohols by Nickel Catalysis
作者:Peng Guo、Ke Wang、Wen-Jie Jin、Hao Xie、Liangliang Qi、Xue-Yuan Liu、Xing-Zhong Shu
DOI:10.1021/jacs.0c12462
日期:2021.1.13
Catalytic transformation of alcohols via metal-catalyzed cross-coupling reactions is very important, but it typically relies on a multistep procedure. We here report a dynamic kinetic cross-coupling approach for the direct functionalization of alcohols. The feasibility of this strategy is demonstrated by a nickel-catalyzed cross-electrophile arylation reaction of benzylalcohols with (hetero)aryl electrophiles
Arylethanolamine derivatives, their preparation and use in
申请人:Beecham Group p.l.c.
公开号:US04588749A1
公开(公告)日:1986-05-13
Compounds of formula (II): ##STR1## or a pharmaceutically acceptable salt thereof, in which X is an oxygen atom or a bond, R.sup.1 is a hydrogen, fluorine, chlorine or bromine atom or a trifluoromethyl or C.sub.1-4 alkyl group, each of R.sup.2 and R.sup.3 is a hydrogen atom or a C.sub.1-4 alkyl group, R.sup.4 is a C.sub.1-4 alkyl group, R.sup.5 is a hydrogen atom or a C.sub.1-4 alkyl group, and n is an integer of from 1 to 3; are useful as anti-obesity and/or anti-hyperglycaemic agents.
DIALKYL(2-ALKOXY-6-AMINOPHENYL)PHOSPHINE, THE PREPARATION METHOD AND USE THEREOF
申请人:Ma Shengming
公开号:US20140309422A1
公开(公告)日:2014-10-16
The present invention relates to the compound of dialkyl(2-alkoxy-6-aminophenyl)phosphine and the preparation method thereof and the application in the palladium catalyzed coupling reactions of aryl chloride and ketone. The dialkyl(2-alkoxy-6-aminophenyl)phosphine of the present invention could coordinate with the palladium catalyst to highly selectively activate the inert carbon-chlorine bond, and to catalyze direct arylation reaction in the α-position of ketones to produce corresponding coupling compounds. The preparation method of the present invention is a simple one-step method which produces the air-stable dialkyl(2-alkoxy-6-aminophenyl)phosphine. Compared with the synthetic routes of ligands to be used in the activation of carbon-chlorine bonds in the prior arts, the preparation method of the present invention has the advantages of short route and easy operation.
Secondary amines, their preparation and use in pharmaceutical
申请人:Beecham Group Limited
公开号:US04396627A1
公开(公告)日:1983-08-02
Compounds having the formula: ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, Y and X are as defined hereinbelow, are useful for the reduction of abnormally high blood glucose and lipid levels in the treatment of obesity or hyperglycaemia.
Organic Base Enabled Nickel‐Catalyzed Mono‐α‐Arylation of Feedstock Solvents
作者:Joshua W. M. MacMillan、Ryan T. McGuire、Mark Stradiotto
DOI:10.1002/chem.202200764
日期:2022.5.16
We report on our successful development of the first metal-catalyzed mono-α-arylation of carbonyl compounds employing a soluble organic base. The scope of these Ni/DalPhos-catalyzed transformations encompasses a range of (hetero)aryl halides (Cl, Br, I) and phenol-derived electrophiles (sulfonates, carbonates, carbamates, sulfamates), including active pharmaceutical ingredients (chloroquine, clozapine)