Design of C3-Alkenyl-Substituted 2-Indolylmethanols for Catalytic Asymmetric Interrupted Nazarov-Type Cyclization
作者:Cong-Shuai Wang、Jia-Le Wu、Can Li、Lin-Zhi Li、Guang-Jian Mei、Feng Shi
DOI:10.1002/adsc.201701521
日期:2018.3.1
The C3‐alkenyl‐substituted 2‐indolylmethanols have been designed as a new class of substrates for catalytic asymmetric interrupted Nazarov‐type cyclizations. In the presence of chiral phosphoric acid as a mild chiral Brønsted acid, the interrupted Nazarov‐type cyclization of C3‐alkenyl‐substituted 2‐indolylmethanols with nucleophiles occurred smoothly to construct cyclopenta[b]indole frameworks in
C3-烯基取代的2-吲哚基甲醇被设计为催化不对称间断Nazarov型环化反应的新型底物。在存在手性磷酸作为温和的手性布朗斯台德酸的情况下,C3-烯基取代的2-吲哚基甲醇与亲核试剂的间断Nazarov型环化顺利发生,从而以通常优异的非对映异构和对映选择性(如上式)构建环戊[ b ]吲哚骨架到> 95:5 dr,> 99%ee)。