First reactions of vinylindoles with diethyl mesoxalate, nitrosobenzene, and chlorosulfonyl isocyanate: New functionalized and []annellated indoles
作者:Ulf Pindur、Myung-Hwa Kim
DOI:10.1016/s0040-4020(01)89519-3
日期:1989.1
3-vinylindoles via electrophilic substitution to give new, functionalized and annellated indoles in high regioselectivities. Regio-controlled dimerization processes occur in the reactions of the vinylindoles 5a and 8a. Nitrosobenze reacts with 2- and 3-vinylindoles in a multi-stage sequence including regiospecific tandem hetero-Diels-alder reactions to give the new, 2,3-difunctionalized indoles 11 and 12 which
甲基草酸二乙酯通过亲电子取代反应与2-和3-乙烯基吲哚反应,从而以高区域选择性生成新的,官能化的和环化的吲哚。在乙烯基吲哚5a和8a的反应中发生区域控制的二聚化过程。亚硝基苯与2-和3-乙烯基吲哚在多阶段序列中反应,包括区域特异性串联异狄尔斯-阿尔德反应,得到新的2,3-二官能化的吲哚11和12,它们通过质子螯合而构象稳定。杂异丙基氯磺酰基异氰酸酯以简单的亲电试剂(如中草酸二乙酯)与2-乙烯基吲哚5b反应,生成吲哚-3-甲酰胺14。另外,还研究了-甲基吲哚的类似反应,并且在大多数情况下,给出了可比较的反应模式。