Efficient and Economical Access to Substituted Benzothiazoles: Copper-Catalyzed Coupling of 2-Haloanilides with Metal Sulfides and Subsequent Condensation
Don′t tell azole: The first metal‐catalyzed direct coupling of metalsulfides with aryl halides and subsequent intramolecular condensation provided substitutedbenzothiazoles (see scheme). A wide range of functional groups are tolerated under the reaction conditions.
An efficient heterogeneous copper-catalyzed cyclization of o-haloanilides and metalsulfides has been achieved via the C–S coupling in DMF at 80 or 140 °C in the existence of an MCM-41-bound NHC-Cu(I) catalyst and then intramolecular condensation, delivering a wide range of substitutedbenzothiazoles in mostly good to high yields. This new MCM-41-NHC-CuI complex can facilely be obtained by a two-step
Mg(ClO4)2-catalyzed intramolecular allylic amination: application to the total synthesis of demethoxyfumitremorgin C
作者:Danfeng Jiang、Zhengren Xu、Yanxing Jia
DOI:10.1016/j.tet.2012.03.097
日期:2012.6
A Mg(ClO4)2-catalyzed intramolecularamination of allylic alcohols with carbamate or sulfonamide nucleophiles to form substituted piperidine and pyrrolidine derivatives has been developed. This method has been successfully applied to the total synthesis of demethoxyfumitremorgin C.