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
螺(1-吡唑啉-3,1'-环丙烷)的氢氯化在偶氮环丙烷基团上区域选择性地进行以形成3-(2-卤乙基)吡唑啉衍生物。如果后者在杂环中含有卤素原子,它们很容易转化为(2-卤乙基)吡唑氢卤化物。3-氰基螺(2-吡唑啉-5,1'-环丙烷)在 20°C 与 N-溴琥珀酰亚胺的溴化进行,环丙烷环保留,形成 3-溴-3-氰基螺(1-吡唑啉-5,1'-环丙烷),在 3-4 天后,在约 20°C 下以约 60% 的产率转化为(2-溴乙基)氰基吡唑。