Table 1.

Investigation on the effects of substituents on the diastereoselectivity.^a

Entry	Substrate	Product, yield,b drc
1	2a (R1 = t-Bu, R2 = t-Bu)	(±)-3a, 68%, 14:1 dr
2	2b (R1 = t-Bu, R2 = iPr)	(±)-3b, 64%, 3:1 dr
3	2c (R1 = Ph, R2 = t-Bu)	(±)-3c, 73%, 2:1 dr
4	2d (R1 = OiPr, R2 = t-Bu)	(±)-3d, 78%, 3:1 dr

^aReaction conditions: undivided cell, 1 (0.03 mmol), 2 (0.3 mmol), H₂O (1 mL), MeCN (9 mL), 3.5 F mol⁻¹. ^bIsolated yield. ^cDetermined by ¹H NMR analysis of the crude reaction mixture.