Ga(OTf)3-Catalyzed Direct Substitution of Alcohols with Sulfur Nucleophiles
摘要:
It is reported that Ga(OTf)(3) catalyzes the direct displacement of alcohols with sulfur nucleophiles. The products are versatile intermediates that can be utilized in carbon carbon, carbon sulfur bond formation or used in modified Julia olefination reactions. The only byproduct generated is water.
Allylic sulfides were synthesized from allylic alcohols 1 using S, S'-bis(1-phenyl-1H-tetrazol-5-yl) dithiocarbonate (2) by means of a single-step reaction. The allylic sulfides were coupled with a Grignard reagent or carbanion in the presence of a catalytic amount of copper(I) bromide or palladium(0).
Single-step preparation of allylic sulfides having 1-phenyltetrazole-5-thio group from allylic alcohols using ,′-BIS(1-phenyl-1-tetrazol-5-YL) dithiocarbonate and reactions involving the allylic sulfides
The reaction of allylicalcohols and ,′-bis(1-phenyl-1-tetrazol-5-yl) dithiocarbonate () gave allylic sulfides having 1-phenyltetrazole-5-thio group in a single step. Furthermore, these allylic sulfides could be applied to carbon-carbon bond and carbon-sulfur bond formations by using Grignard reagents or carbanions in the presence of a catalytic amount of copper(I)bromide or palladium (0), respectively
Direct Synthesis of Thioethers from Carboxylates and Thiols Catalyzed by FeCl<sub>3</sub>
作者:Kunuru Venkatesham、Chitturi Bhujanga Rao、Chanti Babu Dokuburra、Richard A. Bunce、Yenamandra Venkateswarlu
DOI:10.1021/acs.joc.5b02143
日期:2015.11.20
A new and efficient method has been developed for the synthesis of thioethers from carboxylates and thiols. The reaction proceeds via a Fe(III)-catalyzed direct displacement of carboxylates from benzylic or allylic esters by heterocyclic thiols. Short reaction times, good to excellent yields of products, and few side reactions are the significant features of the new protocol.
Silver triflate-promoted coupling reactions of benzylic and allylic sulfides with -silylated enolates of ketones and esters, a synthesis of (±)--turmerone
作者:Kazuyoshi Takeda、Katsumi Torii、Haruo Ogura
DOI:10.1016/s0040-4039(00)94388-0
日期:1990.1
Alkylation of thiols with trichloroacetimidates under neutral conditions
作者:Brian C. Duffy、Kyle T. Howard、John D. Chisholm
DOI:10.1016/j.tetlet.2014.12.042
日期:2015.6
Trichloroacetimidates are displaced with thiols to form the corresponding sulfides without the need for an added acid or base by simply heating the reactants in refluxing THF. This operationally simple procedure provides the corresponding sulfides in excellent yields with only the formation of the neutral trichloroacetamide as the side product. The imidate may also be formed in situ, allowing for a direct method for the formation of sulfides from alcohols. This reaction provides a general method for the synthesis of a variety of sulfides from inexpensive and readily available alcohol starting materials. (C) 2014 Elsevier Ltd. All rights reserved.