This work describes the first Pd-catalyzed allylic alkylation of thioamides. Various thioamides were efficiently alpha-allylated in high yields and with excellent selectivity for monoallylation under mild reaction conditions. The process not only provides a facile method for the synthesis of functionalized thioamides, but also presents a useful transformation for synthetically important thioamides. (C) 2013 Elsevier Ltd. All rights reserved.
The thioamidation of <i>gem</i>-dibromoalkenes in an aqueous medium
作者:Jigarkumar K. Vankar、Ankush Gupta、Jaydeepbhai P. Jadav、Shankara H. Nanjegowda、Guddeangadi N. Gururaja
DOI:10.1039/d0ob02319a
日期:——
1-dibromoalkenes for thioamidesynthesis has been achieved in an aqueous medium. The presented green protocol emphasizes the suitability of aqueous media for the thioamidation reaction and enables greater selectivity with synthetic utility. A wide range of thioamides in moderate to excellent yields has been achieved using readily available starting materials, with the use of no organic solvents, catalysts
Thio-Michael addition of thioamides and allenes for the selective construction of polysubstituted 2-arylthiophenes <i>via</i> TBAI/H<sub>2</sub>O<sub>2</sub> promoted tandem oxidative annulation and 1,2-sulfur migration
作者:Teng Han、Xiaoyan Luo
DOI:10.1039/c8ob01835a
日期:——
addition/oxidativeannulation of allenes and thioamides for the construction of polysubstituted 2-arylthiophenes under a sulfur migration transformation protocol has been developed. The transition-metal-free protocol achieves the oxidative cyclization reaction of thioamides containing electron-rich substituents with allenes to construct polysubstituted thiophenes selectively by controlling oxidation conditions