Thermal [3+2] Cycloaddition Reaction of N-Acyliminophenanthridinium Betaine with Allenoates: Facile Access to Phenanthridine-fused Tetracyclic Heterocycles
The thermal [3+2] cycloaddition reaction of N-acyliminophenanthridinium betaines with various allenoates has
been investigated. The reaction was operationally simple and proceeded smoothly under mild reaction conditions, providing
a variety of aromatic tetracyclic heterocycles in moderate to excellent yields.
Multicomponent Cascade Cycloaddition Involving Tropone, Allenoate, and Isocyanide: A Rapid Access to a 7,6,5-Fused Tricyclic Skeleton
作者:Shuanglong Jia、Shikuan Su、Chunju Li、Xueshun Jia、Jian Li
DOI:10.1021/ol502656g
日期:2014.11.7
Multicomponent cascade cycloaddition of tropone, allenoate, and isocyanide has been disclosed. This method allows for the rapid construction of a highly unusual tricyclic skeleton in an efficient manner. The proposed transformation proceeds through [8 + 2 + 1] cycloaddition, [1,5]-H shift, and cyclization followed by an alkoxy group migration process.