作者:Thomas G. Back、Russell G. Kerr
DOI:10.1016/s0040-4020(01)96714-6
日期:1985.1
selenoesters 1c and 1i with diazomethane resulted in crossover, with the formation of all four possible α-seleno ketones 2b, 2c, 2h and 2i. A non-concerted mechanism involving attack by the diazo compound upon the acyl carbon atom of an activated selenoester with the formation of a tetrahedral intermediate 11 has been suggested. The reaction of the selenothiocarbamate 4 with diazomethane resulted in 1,3-dipolar
在CuI,CuSePh或Cu粉末存在下,重氮甲烷与一系列硒酸酯1的反应产生了α-(烷基-或芳基硒代)甲基酮2,产率为41-65%。副产物形成了甲基酮3和双(芳基硒代)甲烷9或14。通过与重氮甲烷的常规反应,然后用HBr溶液进行后处理,可以以高收率将硒酸酯直接转化为甲基酮。硒酸酯1c和1i与重氮甲烷的同时铜催化反应导致交叉反应,并形成了所有四种可能的α-硒酮2b,2c,2h和2i。已经提出了一种不确定的机制,该机制涉及重氮化合物对活化的硒酯的酰基碳原子的攻击并形成四面体中间体11。硒代硫代氨基甲酸酯4与重氮甲烷的反应导致1,3-偶极环加成,得到5,而不是插入到酰基-硒键中。