I. Kawasaki, M. Terano, E. Yada
Feb 14, 2005
Citations
0
Influential Citations
7
Citations
Journal
Tetrahedron Letters
Abstract
Abstract Reaction of 1- tert -butoxycarbonyl-3-cyclopentylidenemethyl-1 H -indole with an excess of trifluoroacetic acid in dichloromethane at room temperature gave a cyclic dimer, 13-cyclopentyl-6,7,12,13-tetrahydrospiro[5 H -cyclohepta[1,2- b :4,5- b ′]diindole-6,1′-cyclopentane] in 73% yield as the sole product through a novel cyclo-dimerization process. Structure of the cyclic dimer derived from 5-bromo-1- t -butoxycarbonyl-3-cyclopentylidenemethyl-1 H -indole was elucidated by X-ray crystallographic analysis.