Scheme 2.
Evaluation of Various Alkenesa
aThe reactions were run on a 0.5 mmol scale. “NMR yield” refers to yields determined by1H NMR analysis of the unpurified reaction mixtures with an internal standard; “yield” refers to yields of isolated products after silica gel column chromatography. Diastereomeric ratios were determined by 1H NMR analysis of the unpurified reaction mixtures. The conversion of styrene was >98%, except where noted.bAr1 = 4-MeC6H and Ar3 4 = 4-OMeC6H4.c27% of the alkene was recovered.