accordance to two reaction pathways. Oxidation performed by Cu++ gave 1-methyl-3-carbenindolin-2-one (12), trapped by DMAD to give products 3—5, and p-chlorophenylradical (13), trapped either by DMAD to give 6, or by the free ligand 1 to give 7 or by carbenindolinone and DMAD to give 8. The second pathway involved a [2+2] cycloaddition followed by electrocyclic ring opening and intramolecular cyclization
1-甲基异丁-3-对
氯苯基(2)的
铜(II)络合物根据两个反应途径与
乙炔二
羧酸二甲酯(
DMAD)反应。用Cu进行氧化++,得到1-甲基-3- carbenindolin -2-酮(12),通过
DMAD捕集,得到的产品3-5,和对- chlorophenylradical(13)中,由任一
DMAD捕集,得到6,或通过游离
配体1,得到7或通过carbenindolinone和
DMAD,得到8.第二途径涉及[2 + 2]环加成,接着电环开环和分子内环化,得到1-甲基-2-二氢
吲哚-3-螺-5 '-1'-对
氯苯基-3',4'-二甲氧基羰基-2'-
吡唑啉(9)的结构和构型通过独立合成证明。讨论了反应机理。