Alkene Isomerization-Hydroarylation Tandem Catalysis: Indole C2-Alkylation with Aryl-Substituted Alkenes Leading to 1,1-Diarylalkanes
作者:Takeshi Yamakawa、Naohiko Yoshikai
DOI:10.1002/asia.201400135
日期:2014.5
with nonconjugated arylalkenes through a tandem alkene isomerization–hydroarylation process, affording 1,1‐diarylalkanes with exclusive regioselectivity. The feasibility of the tandem catalysis was demonstrated for allyl‐, homoallyl‐, and bishomoallylbenzene derivatives. The catalytic system is also applicable to a variety of β‐substituted styrene derivatives. Mechanistic experiments using deuterium‐labeled
发现由CoBr 2,咪唑鎓盐和环己基溴化镁生成的钴N杂环卡宾催化剂可通过串联烯烃异构化-氢芳基化过程促进吲哚与非共轭芳烃的亚胺定向C2-烷基化,提供1,1-二芳基烷烃具有独特的区域选择性。证明了对烯丙基,高烯丙基和双烯丙基烯丙基苯衍生物进行串联催化的可行性。该催化体系也适用于各种β-取代的苯乙烯衍生物。使用氘标记的吲哚底物和格氏试剂的机理实验提供了对钴介导的C的了解。H活化步骤,可能涉及交换前者的C2-氢原子和后者的β-氢原子。