Synthesis of bicyclo[3.1.0]hexanones via 1,3-dipolar cycloaddition of diazoalkanes to homochiral α-sulfinyl-2-cyclopentenones
作者:José Luis García Ruano、Marina Alonso、David Cruz、Alberto Fraile、M. Rosario Martín、M. Teresa Peromingo、Amelia Tito、Francisco Yuste
DOI:10.1016/j.tet.2008.08.088
日期:2008.11
and controls the π-facial and endo/exo selectivities. The π-facial selectivity can be inverted in the presence of Yb(OTf)3, which makes possible the stereodivergent synthesis of both diastereoisomeric pyrazolines. Completely stereoselective denitrogenation of optically pure pyrazolines into cyclopropanes was achieved under substoichiometric Yb(OTf)3 catalysis.