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.
Ga(OTf)<sub>3</sub>-Catalyzed Direct Substitution of Alcohols with Sulfur Nucleophiles
作者:Xinping Han、Jimmy Wu
DOI:10.1021/ol102565b
日期:2010.12.17
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.
C(sp3)−H (N‐Phenyltetrazole)thiolation as an Enabling Tool for Molecular Diversification
作者:Ashley K. Z. Zachmann、Justine A. Drappeau、Shubin Liu、Erik J. Alexanian
DOI:10.1002/anie.202404879
日期:2024.7.15
Methods enabling the broad diversification of C(sp3)–H bonds from a common intermediate are especially valuable in chemical synthesis. Herein, we report a site‐selective (N‐phenyltetrazole)thiolation of aliphatic and (hetero)benzylic C(sp3)–H bonds using a commercially available disulfide to access N‐phenyltetrazole thioethers. The thioether products are readily elaborated in diverse fragment couplings for C–C, C–O, or C–N construction. The C–H functionalization proceeds via a radical‐chain pathway involving hydrogen atom transfer by the electron‐poor N‐phenyltetrazolethiyl radical. Hexafluoroisopropanol was found to be essential to reactions involving aliphatic C(sp3)–H thiolation, with computational analysis consistent with dual hydrogen bonding of the N‐phenyltetrazolethiyl radical imparting increased radical electrophilicity to facilitate the hydrogen atom transfer. Substrate is limiting reagent in all cases, and the reaction displays an exceptional functional group tolerance well suited to applications in late‐stage diversification.