Stereospecific cyclopropenic synthesis of -chrysanthemic methyl ester.2. The by-passing diazoalkane way (1).
作者:M. Franck-Neumann、M. Miesch
DOI:10.1016/s0040-4039(00)87119-1
日期:1982.1
A stereospecific synthesis of cis-chrysanthemate by catalytic hydrogenation of a cyclopropene is described. The required precursor, a 3H-pyrazole, is obtained here via a novel dianion reaction and MnO2 dehydrogenation of a Δ2-pyrazoline, instead of the more cumbersome diazoaddition method.