Efficient Synthesis of Enantiomerically Pure α-Alkyl Cyclopropanecarbonitrile Derivatives from Pyrazolines
作者:José L. García Ruano、Sergio A. Alonso de Diego、M. Rosario Martín、Esther Torrente、Ana M. Martín Castro
DOI:10.1021/ol047937f
日期:2004.12.1
[reaction: see text] Thermolysis of enantiopure sulfonyl pyrazolines 4 and 5, easily obtained from (Z)-3-p-tolylsulfinylacrylonitriles (1), afforded sulfonyl cyclopropanes (6, 7) in a completely stereoselective manner in almost quantitative yields. Both cyclopropanes and alkylidenecyclopropanes, containing one or two chiral carbon atoms, one of them being quaternary, were obtained by hydrogenolysis