1-dimethyl-3-aryl-thioureas were synthesised in good yields (70–92%) by reacting arylamines with S-aryl-N,N-dimethylthiocarbamate in DMSO in the presence of NaH at 90 °C. It is noteworthy that this method can also be used for arylamines containing a halogen atom at the ortho position.
在 90 °C 下,在 NaH 存在下,通过芳胺与 S-芳基-N,N-二甲基硫代氨基甲酸酯在 DMSO 中反应,合成了一系列 11 1,1-二甲基-3-芳基-硫脲,收率良好(70-92%) . 值得注意的是,该方法也可用于在邻位含有卤素原子的芳胺。
NaH-Promoted Transformation of Arylthioureas to Aryl-Isothioureas by S-Allylation and S-Benzylation Reactions
aryl-isothioureas were prepared in excellent yields (80–97%) by reacting substituted arylthioureas with allylbromide or substituted benzylbromides in the presence of NaH in DMSO at room temperature. The substituent variations on the benzyl reactants had a larger effect on the yields than substituent variations on the allyl reactants. The method provides a facile and convenient preparation of some potentially biologically
在室温下,在 NaH 的 DMSO 中,通过取代芳基硫脲与烯丙基溴或取代苄基溴反应,以极好的收率(80-97%)制备了一系列 16 取代的芳基异硫脲。苄基反应物的取代基变化比烯丙基反应物的取代基变化对产率的影响更大。该方法提供了一些潜在生物活性化合物的简便和方便的制备。
Easy S-Alkylation of Arylthioureas and 2-Mercaptobenzothiazoles Using Tetraalkylammonium Salts under Transition-Metal-Free Conditions
作者:Xiao-Hu Xu、Er-Jun Hao、Zhen Shi、Zhi-Bing Dong
DOI:10.1021/acs.joc.2c00728
日期:2022.8.5
A highly-efficient and practical method for S-alkylation of arylthioureas was reported. Using tetraalkylammonium salts as alkylation reagents, a series of 68 S-substituted aryl-isothioureas were obtained in good to excellent yields under transition-metal-free conditions. The protocol features simple performance, broad functional group tolerance, good to excellent yields, and easily available starting