Table 3.

^a Variations in Vinylic Substitution.

entry	comp'd	product	yield, %b	drc	ee, %d
1	a		87	>97:3	99
2	b		85	>97:3	99
3	c		86	>97:3	99
4	d		89	>97:3	99

^aReaction conducted with 23 (0.50 mmol, 1.0 equiv), 6 (0.60 mmol, 1.2 equiv) or 22 (1.0 mmol, 2.0 equiv) and Rh₂(R-DOSP)₄ (0.0005 mmol, 0.1 mol %), unless otherwise indicated.

^bIsolated yield of the major diastereomer.

^cDetermined by ¹H NMR analysis of the crude reaction residue.

^dDetermined by HPLC analysis on a chiral stationary phase.