Investigation of the scope and mechanism of copper catalyzed regioselective methylthiolation of aryl halides
摘要:
Methylthiolation of structurally diverse aryl halides was accomplished under fluoride free conditions using catalytic amounts of CuI, and DMSO as the methylthiolation source. Optimization studies unveiled several varieties of promoters among which Zn(OAc)(2) was found ideal. The analogous reaction with DMSO-d(6) afforded corresponding deuterated aryl methyl thioether with 99% purity. Mechanistic studies revealed CuSMe as the active methylthiolation agent. (C) 2013 Elsevier Ltd. All rights reserved.
Palladium-catalyzed intermolecular transthioetherification of aryl halides with thioethers and thioesters
作者:Yahui Li、Gao Bao、Xiao-Feng Wu
DOI:10.1039/c9sc05532k
日期:——
Functional group transfer reactions are an important synthetic tool in modern organic synthesis. Herein, we developed a new palladium-catalyzed intermolecular transthioetherification reaction of arylhalides with thioethers and thioesters. The synthetic utility and practicality of this catalytic protocol are demonstrated in a wide range of successful transformations (>70 examples). This catalytic protocol
cyclopropylmethylthio groups can be easily introduced into the aromatic rings from the corresponding S-[2-(dimethylamino)ethyl]isothiourea dihydrochloride and S-cyclopropylmethylisothiourea hydrobromide. The possible reaction mechanism is proposed. It is believed that this route to aryl alkyl sulfides is well competitive with currently known methods due to its wide substrate scope, excellent yields, easy
Aminopyrazine compounds as modulators of an adenosine receptor are provided. The compounds may find use as therapeutic agents for the treatment of diseases mediated through a G-protein-coupled receptor signaling pathway and may find particular use in oncology.
Selective oxidation of (hetero)sulfides with molecular oxygen under clean conditions
作者:Kai-Jian Liu、Ji-Hui Deng、Jie Yang、Shao-Feng Gong、Ying-Wu Lin、Jun-Yi He、Zhong Cao、Wei-Min He
DOI:10.1039/c9gc03713f
日期:——
into distinct high-value products is a particularly attractive concept and a daunting synthetic challenge. In the present work, the first example of efficient and selectiveoxidation of sulfides to sulfones and sulfoxides using molecularoxygen under clean conditions was established.
Quinoline and phenanthroline preparation starting from glycerol via improved microwave-assisted modified Skraup reaction
作者:Hanen Saggadi、Denis Luart、Nicolas Thiebault、Isabelle Polaert、Lionel Estel、C. Len
DOI:10.1039/c4ra00758a
日期:——
An efficient “green” modified Skraupreaction in neat water was developed using inexpensive, abundant and environmentally-friendly glycerol under microwave irradiation conditions. Starting from aniline derivatives, various quinolines were obtained in 10–66% yields. The use of nitroaniline led to the corresponding phenanthrolines in 15–52% yields, respectively.