Zinc Chloride Mediated Nucleophilic Substitution: Amination and Thioetherification of Alcohols at Room Temperature
作者:Ashima Singh、Shruti Gupta、Jitender M. Khurana
DOI:10.1080/00304948.2020.1716617
日期:2020.3.3
Catalytic chemistry is one of the focal points for the development of environmentally benign organic transformations. It is true that the employment of catalysts in organic transformations comes wi...
An object of the present invention is to provide a novel substance that has a high reactivity as a fluorinating agent, is effectively used in various fluorination reactions, and is safely handled even in air. As the solution for achieving this object, the present invention provides a complex obtained by reacting bromine trifluoride with at least one metal halide selected from the group consisting of halogenated metals and halogenated hydrogen metals in a nonpolar solvent. This complex serves as a fluorinating agent that provides excellent fluorination performance and that is stable in air.
An operationally simple EosinYcatalyzed sulfenylation of hydrazones has been realized to afford a range of thioethers under visible light. The methodology provides high yields of thioethers under ambient conditions employing readily available and inexpensive starting materials. The reaction has broad substrate scope and is compatible with various functional groups.
A metal-free procedure for the synthesis of thioethers is described via the base-promoted reductive coupling of tosylhydrazones with thiols through an insertion of a carbene into the S–H bond.
A facile and sustainable protocol for the thiolation of hydrazones with sodiumsulfinates has been developed in the presence of CuBr2 and DBU in DMF to afford diverse benzylic thioethers. Control experiments reveal a radical pathway involving a thiyl radical as a key intermediate.