Radical Ring Closures of 4-Isocyanato Carbon-Centered Radicals
作者:Patricia L. Minin、John C. Walton
DOI:10.1021/jo034002o
日期:2003.4.1
The 2-(2-isocyanatophenyl)ethyl radical was generated from the corresponding bromide with tributyltin and tris(trimethylsilyl)silyl radicals and shown to ring close in the 6-endo-mode to afford 3,4-dihydro-1H-quinolin-2-one as the major product. Cyclization in the 5-exo-mode to produce 2,3-dihydroindole-1-carbaldehyde, after hydrogen abstraction, was a minor reaction. Rate constants for the two processes