Novel cyclo-dimerization of 1-tert-butoxycarbonyl-3-alkenylindole derivatives
摘要:
Reaction of 1-tert-butoxycarbonyl-3-cyclopentylidenemethyl-1H-indole with an excess of trifluoroacetic acid in dichloromethane at room temperature gave a cyclic dimer, 13-cyclopentyl-6,7,12,13-tetrahydrospiro[5H-cyclohepta[1,2-b:4,5-b(1)]di-indole-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-1H-indole was elucidated by X-ray crystallographic analysis. (C) 2004 Elsevier Ltd. All rights reserved.
Novel cyclo-dimerization of 1-tert-butoxycarbonyl-3-alkenylindole derivatives
摘要:
Reaction of 1-tert-butoxycarbonyl-3-cyclopentylidenemethyl-1H-indole with an excess of trifluoroacetic acid in dichloromethane at room temperature gave a cyclic dimer, 13-cyclopentyl-6,7,12,13-tetrahydrospiro[5H-cyclohepta[1,2-b:4,5-b(1)]di-indole-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-1H-indole was elucidated by X-ray crystallographic analysis. (C) 2004 Elsevier Ltd. All rights reserved.