Electrogeneration of (Z)-α-aroyloxy-β-aroylthiostilbenes and (Z)-4,5-diaryl-2-arylimino-1,3-oxathioles by cathodic reduction of monothiobenzils in the presence of electrophilic reagents. Computational B3LYP and RI-MP2 study on the relative stability of oxathiole compounds
作者:Antonio Guirado、Andrés Zapata、Raquel Andreu、José I. López Sánchez、María D. Paredes、Juan E. López Sánchez、Delia Bautista、Peter G. Jones、Jesús Gálvez
DOI:10.1016/j.tet.2010.12.044
日期:2011.2
Electrochemical reductions of monothiobenzils in the presence of either aroyl or carbonimidoyl dichlorides were carried out, yielding products with sulfur retention. Electrolyses in the presence of aroyl chlorides led to previously unknown (Z)-α-aroyloxy-β-aroylthiostilbenes in high to quantitative yields, whereas reactions in the presence of arylcarbonimidoyl dichlorides provided novel 4,5-diaryl-2-arylimino-1
在芳酰基或碳亚氨基酰二氯存在下,进行单硫代苯的电化学还原,得到具有硫保留的产物。在芳酰氯存在下进行电解可以高产量定量获得以前未知的(Z)-α-芳酰氧基-β-芳酰硫代苯乙烯,而在芳基碳亚氨基二氯化物存在下进行反应可提供新颖的4,5-二芳基-2-芳基-1, 3-草硫醇以中等至高产。(Z)-α-苯甲酰氧基-β-苯甲酰硫基-4,4'-二甲基sti和(Z通过X射线晶体学测定)-2-(2,4-二氯苯基亚氨基)-4,5-二苯基-1,3-草硫醇。同样,从头算HF,密度函数B3LYP和Møller-PlessetRI-MP2方法应用于草硫醇化合物,表明(Z)-异构体比(E)-异构体更稳定,并且两个异构体之间的活化程度相对较低障碍。