Synthesis of Thioesters by Simultaneous Activation of Carboxylic Acids and Alcohols Using PPh<sub>3</sub>/NBS with Benzyltriethylammonium Tetrathiomolybdate as the Sulfur Transfer Reagent
A new and simple route for the synthesis of thioesters starting from carboxylicacids and alcohols is reported by usingtetrathiomolybdate as the key sulfurtransferreagent. Triphenylphosphane and N-bromosuccinimide were used for the activation of the carboxylicacid and alcohol in the same pot followed by the transfer of sulfur from tetrathiomolybdate. Thioesters were obtained in good to moderate
Palladium Catalyzed Direct Carbonylative Thiomethylation of Aryldiazonium Salts and Amines with 4-(Methylthio)-2-Butanone as (Methylthio) Transfer Agent
作者:Qingqiang Tian、Shasha Xu、Chiying Zhang、Xinyi Liu、Xiangwei Wu、Yahui Li
DOI:10.1021/acs.joc.1c00665
日期:2021.7.2
Herein, an interesting palladium-catalyzed procedure for the direct carbonylative thiomethylation of aromatic amine derivatives with 4-methylthio-2-butanone is developed. Using 4-methylthio-2-butanone as (methylthio) transfer agent, a variety of corresponding thioesters are obtained with moderate to good yields under base-free condition. In addition, good functional group tolerance can be observed
Montmorillonite K 10-catalyzed regioselective addition of thiols and thiobenzoic acids onto olefins: an efficient synthesis of dithiocarboxylic esters
作者:Subbareddy Kanagasabapathy、Arumugam Sudalai、Brian C Benicewicz
DOI:10.1016/s0040-4039(01)00570-6
日期:2001.6
The addition of thiols and thiobenzoicacids onto olefins proceeded regioselectively in a Markovnikov manner in the presence of Montmorillonite K 10 (Mont K 10) clay as the catalyst to afford thioethers and thiocarboxylic S-esters, while high selectivity to anti-Markovnikov products was realized in the absence of any catalyst. Treatment of the esters with Lawesson's reagent provided the corresponding
在蒙脱石K 10(Mont K 10)粘土作为催化剂提供硫醚和硫代羧酸S酯的存在下,以马尔科夫尼科夫方式选择性地将硫醇和硫代苯甲酸加到烯烃上,同时实现了对反马尔科夫尼科夫产物的高选择性。在没有任何催化剂的情况下。用Lawesson试剂处理酯类,可以高收率得到相应的二硫代羧酸酯。
Microwave-Assisted Direct Thioesterification of Carboxylic Acids
N′-diphenylthiourea, triethylamine, and primary alkyl halides is described. Microwave-assisted heating and a catalytic amount of 4-(dimethylamino)pyridine (DMAP) further improved the yields. Both aromatic and aliphatic carboxylic acids were converted to the corresponding thioesters, and many functionalgroups were compatible with this reaction. Several possible reaction intermediates were investigated, and the