Air- and Light-Stable <i>S</i>-(Difluoromethyl)sulfonium Salts: <i>C</i>-Selective Electrophilic Difluoromethylation of β-Ketoesters and Malonates
作者:Sheng-Le Lu、Xin Li、Wen-Bing Qin、Jian-Jian Liu、Yi-Yong Huang、Henry N. C. Wong、Guo-Kai Liu
DOI:10.1021/acs.orglett.8b03067
日期:2018.11.2
Air- and light-stable electrophilic difluoromethylating reagents, S-(difluoromethyl)-S-phenyl-S-(2,4,6-trialkoxyphenyl) sulfonium salts were successfully developed, and the introduction of intramolecular hydrogen bonds plays a crucial role for the stabilities and reactivities of these reagents. C-selective difluoromethylation of a broad range of β-ketoesters and malonates proceeded smoothly under mild
<i>gem-</i>Difluoroolefination of Diazo Compounds with TMSCF<sub>3</sub> or TMSCF<sub>2</sub>Br: Transition-Metal-Free Cross-Coupling of Two Carbene Precursors
作者:Mingyou Hu、Chuanfa Ni、Lingchun Li、Yongxin Han、Jinbo Hu
DOI:10.1021/jacs.5b09888
日期:2015.11.18
fragment resulting from a diazocompound and a difluorocarbene fragment derived from Ruppert-Prakash reagent (TMSCF3) or TMSCF2Br, has been developed. This gem-difluoroolefination proceeds through the direct nucleophilic addition of diazocompounds to difluorocarbene followed by elimination of N2. Compared to previously reported Cu-catalyzed gem-difluoroolefination of diazocompounds with TMSCF3, which possesses
7-HYDROXY-PYRAZOLO[1,5-A] PYRIMIDINE COMPOUNDS AND THEIR USE AS CCR2 RECEPTOR ANTAGONISTS
申请人:Boyd Joe William
公开号:US20130252951A1
公开(公告)日:2013-09-26
The compounds of formula (I) are antagonists of the CCR2 receptor Wherein R
1-7
and A are as defined in the claims.
式(I)的化合物是CCR2受体的拮抗剂,其中R1-7和A如权利要求中所定义。
Copper-Mediated Deuterotrifluoromethylation of <i>α</i>
?Diazo Esters
作者:Mingyou Hu、Qiqiang Xie、Xinjin Li、Chuanfa Ni、Jinbo Hu
DOI:10.1002/cjoc.201600004
日期:2016.5
ation of α?diazo esters under the promotion of deuterium oxide (D2O) has been developed for the synthesis of deuterium‐labeled trifluoromethyl compounds. This deuterotrifluoromethylation reaction is of broad scope and can afford the deuterated products with higher than 99% isotopic purity. Moreover, the results of this investigation also provide some experimental evidences to support our previously
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.