Table 1.

Michael addition of 1,3-dicarbonyl compounds 3b–g to nitrostyrene 2a.

Entry	R1	R2		Yield/%	dra
1	Me	OEt	c	74	58:42
2	Et	OMe	d	55	54:46
3	iPr	OMe	e	54	53:47
4	Ph	OEt	f	67	54:46
5	Me	Me	b	56	—
6	Me	Ph	g	66	57:43

^aDiastereisomeric ratio determined by ¹H NMR.