Synthese stereospecifique de cis-pyrethroides par voie cyclopropenique utilisant un synthob carbanionique
作者:Michel Franck-Neumann、Michel Miesch、Hubert Kempf
DOI:10.1016/s0040-4020(01)90021-3
日期:1987.1
The synthesis of a series of 4-carbomethoxy 3H-pyrazoles bearing different substituents in position 5 is described. These are obtained by deprotonation of 3,3,5-trimethyl 4-carbomethoxy 3H-pyrazole followed by reaction with different electrophiles. The intermediate carbanion can be considered as a synthetic equivalent of the α-cyclopropropylcarbanion , since the photolysis of the obtained 3H-pyrazoles
描述了在位置5带有一系列不同取代基的一系列4-羰甲氧基3H-吡唑的合成。这些是通过使3,3,5-三甲基4-羰甲氧基3H-吡唑去质子化,然后与不同的亲电试剂反应而获得的。中间碳负离子可以认为是α-环丙丙基碳负离子的合成等价物,因为获得的3H-吡唑的光解会产生环丙烯,该环丙烯易于氢化,生成顺式-二取代的宝石-二甲基环丙烷酸酯。这些是吡虫啉的直接前体(下一个acticle)。