开发了一种基于咔唑衍生物的保护基依赖性非对映选择性合成环庚[ b ]吲哚。该策略涉及3-炔丙基-2-烯基吲哚的区域选择性6-外三自由基环化-环丙烷化-环扩展级联。还对具有炔烃、丙烯酸酯和插烯氨基甲酸酯部分的吲哚衍生物进行级联自由基环化,产生吡啶并咔唑,这证实了机理假说。此外,环庚[ b ]吲哚可以通过分子内弗里德尔-克来福特酰化选择性转化为砜和亚砜以及苯并薁吲哚。
Enantioselective Organo-SOMO Cascade Cycloadditions: A Rapid Approach to Molecular Complexity from Simple Aldehydes and Olefins
作者:Nathan T. Jui、Esther C. Y. Lee、David W. C. MacMillan
DOI:10.1021/ja104313x
日期:2010.7.28
radical-mediated (4 + 2) coupling reaction of aldehydes and conjugated olefins has been achieved through asymmetric SOMO-catalysis. A radical-polar crossover mechanism is proposed wherein olefin addition to a transient enamine radical cation and oxidation of the resulting radical furnishes a cation which is vulnerable to nucleophilic addition. A range of aromatic aldehydes are shown to couple with styrenes and
Cascade radical cyclization on 3-propargyl-2-alkenyl indole gives stereoselective access to cyclohepta[<i>b</i>]indole over carbazole
作者:Santosh J. Gharpure、Sanyog Kumari
DOI:10.1039/d3cc05237k
日期:——
A protecting group-dependent diastereoselectivesynthesis of cyclohepta[b]indole over carbazole derivatives is developed. This strategy involves a regioselective 6-exo-trig radical cyclization-cyclopropanation-ring expansion cascade of 3-propargyl-2-alkenyl indole. The cascade radicalcyclization was also performed on indole derivatives possessing alkyne, acrylate and vinylogous carbamate moieties
开发了一种基于咔唑衍生物的保护基依赖性非对映选择性合成环庚[ b ]吲哚。该策略涉及3-炔丙基-2-烯基吲哚的区域选择性6-外三自由基环化-环丙烷化-环扩展级联。还对具有炔烃、丙烯酸酯和插烯氨基甲酸酯部分的吲哚衍生物进行级联自由基环化,产生吡啶并咔唑,这证实了机理假说。此外,环庚[ b ]吲哚可以通过分子内弗里德尔-克来福特酰化选择性转化为砜和亚砜以及苯并薁吲哚。