Initial results of the Michael reaction^a.

Entry	Catalyst	Time (h)	NMR yield of 3ab (%)	d.r.c	eed (%)
1	—	48	NR	ND	ND
2	A	48	89	85 : 15	−39/−40
3	B	22	84	87 : 13	40/43
4	C e	24	48	77 : 23	26/28
5	B e	24	86	85 : 15	45/46

^aUnless otherwise noted, all reactions were carried out with 0.1 mmol of 1a, 0.2 mmol of 2, and 0.02 mmol of catalyst in 0.2 mL of DCM at RT; NR – no reaction, ND – not determined.

^bRelative amount of 3a compared to the total amount of 1a, 3a and 5; determined from the reaction mixture by ¹H NMR spectroscopy.

^cDetermined from the reaction mixture by ¹H NMR spectroscopy.

^dDetermined by HPLC analysis on a chiral stationary phase.

^e10 mol% of catalyst instead of 20 mol% and (MeO)₃C₆H₃ was used as an internal standard.