External Chiral Ligand-Mediated Enantioselective Peterson Reaction of α-Trimethylsilanylacetate with Substituted Cyclohexanones
摘要:
graphicThe asymmetric Peterson reaction of an alpha-trimethylsilanylacetate with 4-substituted and 3,5-disubstituted cyclohexanones was mediated by an external chiral tridentate ligand to give the corresponding olefins with an axial chirality in high yields and enantioselectivities of up to 85%.
addition of PhSeCl to α- and β-substituted styrenes in methanol is regio- and stereospecific and affords the products of methoxyselenenylation. These compounds further react with PhSeCl to give the deselenenylation products. In the case of α-substituted styrenes, 1-methoxy, 2-chloroalkanes are produced, whereas with β-substituted styrenes the major reaction products are the 1,2-dimethoxyalkanes and
Reductive Coupling of Aromatic Dialkyl Acetals Using the Combination of Zinc and Chlorotrimethylsilane in the Presence of Potassium Carbonate
作者:Bunpei Hatano、Keita Nagahashi、Shigeki Habaue
DOI:10.1246/cl.2007.1418
日期:2007.12.5
The treatment of aromatic acetals with zinc and chlorosilane in the presence of potassium carbonate in toluene brought about facile and effective reductive coupling to give the corresponding coupling products.
METHOD FOR PREPARING CHEMICAL COMPOUNDS OF INTEREST BY NUCLEOPHILIC AROMATIC SUBSTITUTION OF AROMATIC CARBOXYLIC ACID DERIVATIVES SUPPORTING AT LEAST ONE ELECTRO-ATTRACTIVE GROUP
申请人:Mortier Jacques
公开号:US20120316337A1
公开(公告)日:2012-12-13
Method for preparing carboxylic acid derivatives by aromatic nucleophilic substitution, in which a carboxylic acid derivative having a single carboxyl functional group, or one of the salts thereof, the carboxylic acid derivative having, in the ortho position of the carboxyl functional group, a leaving group, which is preferably an atom of fluorine or of chlorine or an alkoxy group, chiral or not, preferably a methoxy group, the carboxylic acid derivative not being substituted by an electro attractive group other than the leaving group if any; is reacted with a reactant MNu, where M is a metal and Nu is a nucleophile, chiral or not, the aromatic nucleophilic substitution reaction being carried out without a catalyst and without a step of protecting/deprotecting the acid functional group of the starting compound.
Synthesis and chemistry of enantiomerically pure 10,11-dihydrodibenzo[b,f]thiepines
作者:Paul Wyatt、Andrew Hudson、Jonathan Charmant、A. Guy Orpen、Hirihattaya Phetmung
DOI:10.1039/b516606c
日期:——
Several chiral thiepines were efficiently constructed using sulfur diimidazole in combination with a variety of bislithiated carbon fragments. The sulfur atom in these thiepines is found to be unusually unreactive compared to diphenylsulfide.
The electrochemical oxidation of methanol and ethanol in the presence of trans-stilbene, cis-stilbene, norbornene, and styrene has been studied. The major gaseous and nongaseous products have been identified and determined, and the corresponding dimethoxylated derivatives and diethoxylated derivatives have been obtained in fairly high yields. The main path by which these products may have arisen has