Table 3.

Catalytic ACA reactions of trialkyl aluminum reagents with cyclohexenones and cycloheptenones promoted by NHC copper complexes.^[a]

Entry	Substrate [R]	(alkyl)3Al	NHC–AgI	T [°C]	t [h]	Yield [%][b]	e.r.[c]	ee [%][c]
1 [d]	8a [Me]	iBu3Al	4	22	0.25	89	95:5	90
2	8b [5-hexenyl]	Me3Al	5	−78	12	85	95:5	90
3	8c [CO2Me]	Et3Al	3	−78	6	91	91.5:8.5	83
4	9a [nBu]	Me3Al	5	−78	12	90	92.5:7.5	85
5	9a [nBu]	Et3Al	5	22	0.25	87	94.5:5.5	89

^[a–c]See Table 2.

^[d]5 mol % CuCl₂·2 H₂O was used.