Convenient Method for the Preparation of the 2-Methyl Thiophen-3-yl Magnesium Bromide Lithium Chloride Complex and Its Application to the Synthesis of 3-Substituted 2-Methylthiophenes
作者:Masakazu Kogami、Nobuhide Watanabe
DOI:10.1080/00397911.2011.606391
日期:2013.1.1
formation of the Grignard reagent from inactive 3-bromo-2-methylthiophene (1) and commercial magnesium metal. Based on this finding, a convenient and potentially scalable preparation of ethyl 2-methylthiophene-3-carboxylate (3) was achieved. In addition, this process has been found to provide a new, general approach to 3-substituted 2-methylthiophenes. GRAPHICAL ABSTRACT
SUBSTITUTED (THIOPHENYL-CARBONYL)IMIDAZOLIDINONES, AND USE THEREOF
申请人:THEDE Kai
公开号:US20120022123A1
公开(公告)日:2012-01-26
The present invention relates to novel substituted (thiophenyl-carbonyl)imidazolidinones, methods for their production, their use for the treatment and/or prevention of diseases, as well as their use for the production of medicaments for the treatment and/or prophylaxis of diseases, especially retroviral diseases, in humans and/or animals.
Direct Bromination of Ethyl 5-Alkylthiophene-2-carboxylates
作者:Ilya Taydakov、Sergey Krasnoselskiy
DOI:10.1055/s-0030-1258160
日期:2010.9
electrophilic bromination of the corresponding acids and esters were compared and investigated. A synthetic route was developed involving direct bromination of ethyl 5-alkylthiophene-2-carboxylates followed by saponification of the resulting ethyl 5-alkyl-4-bromothiophene-2-carboxylates. The key bromination step is selective in dichloromethane solution at 0-5 ˚C and furnishes the corresponding ethyl 5-alk