Reactions of spirocyclopropane-containing 1- and 2-pyrazolines with electrophilic reagents
作者:Yu. V. Tomilov、I. V. Kostyuchenko、G. P. Okonnishnikova、E. V. Shulishov、E. A. Yagodkin、O. M. Nefedov
DOI:10.1007/bf02494777
日期:2000.3
Hydrochlorination of spiro(1-pyrazoline-3,1′-cyclopropanes) proceeds regioselectively at the azocyclopropane group to form 3-(2-haloethyl)pyrazoline derivatives. If the latter contain a halogen atom in the heterocycle, they are readily converted into (2-haloethyl)pyrazole hydrohalides. Bromination of 3-cyanospiro(2-pyrazoline-5,1′-cyclopropane) withN-bromosuccinimide at 20°C proceeds with retention