Model Michael addition in heterogeneous environment catalyzed with IIa and IId^a.

Entry	Catalyst	Solvent	Conversionb (isol. yieldc) [%]	eed [%]	syn : antib
1	IIa	Hexane	44 (23)	82	92 : 8
2	IIa	Toluene	51 (38)	78	94 : 6
3	IIa	DCM	39 (16)	70	92 : 8
4	IIa	MeOH	16 (10)	46	82 : 18
5	IId	Hexane	37 (21)	80	94 : 6
6	IId	Toluene	23 (15)	78	94 : 6
7	IId	DCM	17 (10)	74	92 : 8
8	IId	MeOH	7 (3)	53	86 : 14

^aReaction conditions: nitrostyrene 0.25 mmol, cyclohexanone 250 μl, catalyst 0.05 mmol, acetic acid 0.035 mmol, solvent 1 ml, t = 25 °C, reaction time = 72 h.

^bDetermined by ¹H NMR.

^cPurified by column chromatography (hexane : ethyl acetate = 5 : 1).

^dDetermined by chiral HPLC (column YMC Amylose C, mobile phase heptane : IPA = 9 : 1, flow rate 0.7 ml min⁻¹).