Reactions of pyrazoles and pyrazolium salts with complex metal hydrides and organometallic reagents. Synthesis of pyrazolines and pyrazolidines
作者:Purificación Cuadrado、Ana M. González-Nogal、Senén Martínez
DOI:10.1016/s0040-4020(97)00514-0
日期:1997.6
2-Pyrazolin-4-oximes have been synthesized by reaction of 4-nitroso- and 4-nitropyrazoles with complex metal hydrides and organometallic reagents. Furthermore, 4-nitropyrazolium tetrafluoroborates are reactive substrates towards organolithium and Grignard compounds leading to new and highly substituted 4-nitro-3-pyrazolines and 4-nitropyrazolidines. The formation of 3-pyrazolines is regioselective
2-吡唑啉-4-肟是通过4-亚硝基和4-硝基吡唑与复杂的金属氢化物和有机金属试剂的反应合成的。此外,4-硝基吡唑鎓四氟硼酸盐是有机锂和格氏试剂的反应性底物,从而导致新的和高度取代的4-硝基-3-吡唑啉和4-硝基吡唑烷。3-吡唑啉的形成是区域选择性的,并且当可能存在非对映异构体吡唑烷时,仅获得最稳定的3,4-反式和/或4,5-反式异构体。