Transition-Metal-Free Cleavage of C–C Triple Bonds in Aromatic Alkynes with S<sub>8</sub> and Amides Leading to Aryl Thioamides
作者:Kai Xu、Ziyi Li、Fangyuan Cheng、Zhenzhen Zuo、Tao Wang、Mincan Wang、Lantao Liu
DOI:10.1021/acs.orglett.8b00573
日期:2018.4.20
transition-metal-free cleavage reaction of C–C triplebonds in aromatic alkynes with S8 and amides furnishes aryl thioamides in moderate to excellent yields. The remarkable features of this thioamidation include the metal-free cleavage of C–C triple bond, mild reaction conditions, as well as wide substrate scope that is particularly compatible with some internal aromatic alkynes and acetamides.
K2S2O8-Promoted Aryl Thioamides Synthesis from Aryl Aldehydes Using Thiourea as the Sulfur Source
作者:Yongjun Bian、Xingyu Qu、Yongqiang Chen、Jun Li、Leng Liu
DOI:10.3390/molecules23092225
日期:——
Thiourea as a sulfur atom transfer reagent was applied for the synthesis of aryl thioamides through a three-component coupling reaction with aryl aldehydes and N,N-dimethylformamide (DMF) or N,N-dimethylacetamide (DMAC). The reaction could tolerate various functional groups and gave moderate to good yields of desired products under the transition-metal-free condition.
inexpensive raw materials, showing its practical synthetic value in organic synthesis. A novel and convenient method for the synthesis of aryl thioamides from aryl aldehydes and tetramethylthiuram disulfide (TMTD) without the use of sulfurating reagent was explored. In the presence of CuI and di-tert-butyl peroxide (DTBP), various aryl thioamides were prepared with good to excellent yields, tetramethylthiuram
A BBr3-mediated S-directed ortho C–H borylation of thiobenzamides was developed. A variety of ortho-borylated thiobenzamides were obtained in moderate to good yields with a wide functional group tolerance under simple and metal-free conditions. This transformation provided a convenient and practical route to important functionalized thiobenzamides.