A New Entry to Enantiopure Polysubstituted Cyclopropanes: Stereoselective Denitrogenation of Sulfinylpyrazolines under Yb(OTf)<sub>3</sub> Catalysis
作者:José L. García Ruano、M. Teresa Peromingo、M. Rosario Martín、Amelia Tito
DOI:10.1021/ol061168d
日期:2006.7.1
stereoselective denitrogenation of optically pure pyrazolines, derived from 3-sulfinylfuran-2(5H)-ones, into cyclopropanes can be achieved under substoichiometric Yb(OTf)3 catalysis. Reactions evolve in almost quantitative yields with complete retention of the configuration at both carbons flanking the nitrogen atoms. The resulting enantiomerically pure polysubstituted cyclopropanes, containing up to five substituens