Table 1.

Selected Optimization Results^a

entry	solvent	[nitroalkene]	time (h)	yield (%)b	drc	ee (%)d
1	THF	0.5 m	19	75	8:1	91
2	toluene	0.5 m	8	71	5:1	92
3	Et2O	0.5 m	26	40	1:1	65
4	dioxane	0.5 m	22	69	6:1	93
5	THF	0.25 m	19	76	10:1	91
6	THF	0.125 m	35	71	17:1	92

^aAll reactions were carried out using 1 equiv. of 3a (0.50 mmol), 2 equiv. of 2, 0.10 equiv. of (S,S)-complex 1 and 100 mg 4Å MS.

^bRefers to the isolated mixture of diastereoisomers.

^cDetermined by ¹H NMR of the crude reaction mixture.

^dEnantiomeric excess of the major diastereoisomer, determined by chiral HPLC.