Electrophilic substitution in lndoles. Part 11. The mechanism of substitution in 5-methoxyindoles
作者:Denis W. Clack、Anthony H. Jackson、Noojaree Prasitpan、Patrick V. R. Shannon
DOI:10.1039/p29820000909
日期:——
labelling experiments show that the boron trifluoride-catalysed cyclisation at 90 °C of 4-(5-methoxyindol-3-yl)butanol (1e) to 6-methoxytetrahydrocarbazole (11a) occurs by two simultaneous pathways. The main route (83.5%) involves initial cyclisation at the 3-position of (1e) to give an intermediate spirocyclic indolenine which then rearranges to the tetrahydrocarbazole. The minor pathway (16.5%) involves