Variation of aryl ester^a.

Entry	Aryl ester	Yieldb (%)	Product	drc	er	er
			anti- : syn-		anti d	syn d
1	1	58	4 : 5	49 : 51	79 : 21	93 : 7
2	6	48	10 : 11	48 : 52	87 : 13	97 : 3
3	7	0	—	—	—	—
4	8	48	12 : 13	74 : 26	89 : 11	93 : 7
5	9	51	14 : 15	68 : 32	89 : 11	95 : 5

^aReactions performed on 0.5 mmol scale with 1.0 equiv. of 2 and 1.5 equiv. of ester.

^bCombined yield of diastereoisomers by ¹H NMR analysis of the crude reaction mixture using 1,3,5-trimethoxybenzene internal standard.

^cDetermined by ¹H NMR analysis of the crude product.

^dDetermined by HPLC analysis on a chiral stationary phase.