Table 2. Generality of the Michael Reaction of 1 and 2^a.

entry	R	time (h)	yieldb (%)	eec (%)
1	Phenyl (2a)	3	69	95
2	p-MeO-C6H4 (2b)	24	50	95
3	p-Br-C6H4 (2c)	2	71	94
4	m-Br-C6H4 (2d)	2	75	95
5	o-Br-C6H4 (2e)	2	78	95
6	2-furyl (2f)	30	76	94
7	SiMe2Ph (2g)	12	69	98
8	Me (2h)	24	55	76

^aReactions were performed by employing α,β-unsaturated aldehyde 2 (0.18 mmol), ketone 1 (0.15 mmol), organocatalyst (0.030 mmol), water (0.45 mmol), and p-nitrophenol (0.015 mmol) in EtOH (0.60 mL) at room temperature for the indicated time.

^bIsolated yield.

^cEnantiomeric excess (ee) of the products, as determined by HPLC analysis over a chiral solid phase after conversion to α,β-unsaturated ester by the treatment with Ph₃P = CHCO₂Et.