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.
Transition-Metal-Free Cleavage of C–C Triple Bonds in Aromatic Alkynes with S<sub>8</sub> and Amides Leading to Aryl Thioamides
作者:Kai Xu、Ziyi Li、Fangyuan Cheng、Zhenzhen Zuo、Tao Wang、Mincan Wang、Lantao Liu
DOI:10.1021/acs.orglett.8b00573
日期:2018.4.20
transition-metal-free cleavage reaction of C–C triplebonds in aromatic alkynes with S8 and amides furnishes aryl thioamides in moderate to excellent yields. The remarkable features of this thioamidation include the metal-free cleavage of C–C triple bond, mild reaction conditions, as well as wide substrate scope that is particularly compatible with some internal aromatic alkynes and acetamides.
A general method for one-potsynthesis of thioamides without transition metals or external oxidants is developed through a three-component reaction involving chlorohydrocarbon, amide and elementalsulfur. Both alkyl and aryl thioamides could be obtained in moderate to excellent yields through this protocol. A high tolerance regarding various substituents on chlorohydrocarbon or amide was justified
This Letter describes the first catalytic asymmetric alpha-allylic alkylation of thioamides. By using 5 mol % Pd-(R)-DM-BINAP complex as the chiral catalyst, various thioamides were efficiently alpha-allylic alkylated with 1,3-diarylallyl carbonates under mild conditions, affording a variety of alpha-substituted thioamides in good yields with high enantioselectivity and moderate diastereoselectivity. This work represents a useful and direct route to prepare chiral functionalized thioamides. (C) 2014 Elsevier Ltd. All rights reserved.
Pd-catalyzed α-arylation of thioamides
作者:Hailei Yu、Xuliang Liu、Lei Ding、Qin Yang、Bin Rong、Ang Gao、Baoguo Zhao、Haifeng Yang
DOI:10.1016/j.tetlet.2013.03.114
日期:2013.6
Thioamides are unique and versatile synthetic building blocks with S, N, and alpha-C three adjacent nucleophile centers, however, they are rarely used as carbon nucleophiles for transition-metal-catalyzed C-C coupling reactions. This Letter describes the first Pd-catalyzed alpha-arylation of thioamides and demonstrated the feasibility of the application of thioamides in coupling chemistry. By the coupling process, a variety of alpha-arylated thioamides were prepared in moderate to good yields under mild reaction conditions, which provides an alternative way to access functionalized thioamides as well as a new synthetic transformation for thioamides. High chemoselectivity for thioamide over amide was observed in the reaction. (C) 2013 Elsevier Ltd. All rights reserved.
Novel reaction for the preparation of alkyl vinyl sulfides using metal complex catalysts
作者:U. M. Dzhemilev、N. Z. Baibulatova、R. V. Kunakova、T. K. Tkachenko、G. A. Tolstikov
DOI:10.1007/bf00958250
日期:1990.9
The feasibility of the one-step synthesis of mixtures of Z- and E-alkenyl alkyl sulfides via the reaction of elemental sulfur with terminal and disubstituted alkynes and alkyl halides has been demonstrated in the presence of low-valent Ni, Co, Pd, and Fe complexes. The effects of structure in the starting alkynes and alkyl halides have been investigated, along with process conditions and their effect on the composition and yields of reaction products.