We report highly enantioselective dirhodium-catalyzed B−H bondinsertion reactions with diaryl diazomethanes as carbene precursors. These reactions afforded chiral gem-diarylmethine borane compounds in high yield (up to 99 % yield), high activity (turnover numbers up to 14 300), high enantioselectivity (up to 99 % ee) and showed unprecedented broad functional group tolerance.
Method of producing an o-disubstituted aromatic compound, and method of producing a monosubstituted-monohaloaromatic compound
申请人:Yoshida Jun-ichi
公开号:US20080194816A1
公开(公告)日:2008-08-14
A method of producing an o-disubstituted aromatic compound, containing: continuously conducting at least the following steps (a) to (d):
(a) a step of mono-lithiating one halogen atom of an o-dihaloaromatic compound, using a first microreactor;
(b) a step of making the thus-obtained monolithiated product to react with an electrophilic compound, using a second microreactor, to obtain a monosubstituted-monohaloaromatic compound;
(c) a step of lithiating the other halogen atom of the o-dihaloaromatic compound, using a third microreactor; and
(d) a step of making the thus-obtained lithiated product successively to react with an electrophilic compound, using a forth microreactor.
Copper-catalyzed carbonylative Suzuki coupling of aryl iodides with arylboronic acids under ambient pressure of carbon monoxide
作者:Laijin Cheng、Yanzhen Zhong、Zhuchao Ni、Hongyan Du、Fengli Jin、Qi Rong、Wei Han
DOI:10.1039/c4ra08594a
日期:——
An efficient and ligandless nanocopper-catalyzed carbonylative cross-coupling of aryl iodides with arylboronic acids at ambient CO pressure in poly(ethylene glycol), has been developed.
Highly selective catalytic Friedel–Crafts acylation and sulfonylation of activated aromatic compounds using indium metal
作者:Doo Ok Jang、Kyung Soo Moon、Dae Hyan Cho、Joong-Gon Kim
DOI:10.1016/j.tetlet.2006.06.099
日期:2006.8
Friedel–Crafts acylation of activated benzenes with various aromatic and aliphatic acid chlorides was studied in the presence of indium metal. The reaction was accomplished in high isolated yields under solvent or solvent-less conditions. The method is also applicable for preparing diaryl sulfones from aromatic compounds and aryl sulfonylchlorides.