(E)-Alkenyl halides were transformed into (E)-alkenyl sulfides by the nickel(0) triethyl phosphite complex-catalyzed reaction with thiols, whereas (Z)-alkenyl halides gave alkynes under the same reaction conditions. Aryl halides were also transformed into aryl sulfides using the same reagent system.
Synthesis of benzyl sulfides<i>via</i>substitution reaction at the sulfur of phosphinic acid thioesters
作者:Yoshitake Nishiyama、Takamitsu Hosoya、Suguru Yoshida
DOI:10.1039/d0cc02039g
日期:——
An ambident electrophilicity of phosphinicacid thioesters is disclosed. Unexpected carbon-sulfur bond formation took place in the reaction between phosphinicacid thioesters and benzyl Grignard reagents. The developed method for benzyl sulfides has a wide substrate scope and was applicable for the synthesis of a drug analog.
Nucleophilic attack of thiols on phenylacetylene (1) in liquidammonia at room temperature gave the corresponding Z-isomer of styryl sulfides in high yield stereoselectively. Reaction of 1 with Na2S also proceeded selectively to give Z,Z-distyryl sulfide (12). On the other hand, reaction with NaSH gave 12 besides E,Z-isomer as a minor product.
We report the first copper-catalyzed olefinic ethoxy carbonyl difluoromethylation of alkenyl thioethers via direct C–H bond functionalization using BrCF2COOEt. The developed methodology allows the preparation of trisubstituted olefins with a controlled stereochemistry. A mechanistic study is reported and a radical mechanism is revealed.