Table 1.

Effect of metals on the domino aldol reaction of 1a and 3a at different temperatures (reaction time: 2 h) on the yield of 5a and 6a.

Entry	Metal	Yield of 5a and 6a at various temperatures
		at 0 °C		at 25 °C		at 67 °C
		5a (%)	6a (%)	5a (%)	6a (%)	5a (%)	6a (%)
1	Al	18	19	64a	8	8	−
2	Ga	17 (+20)b	22	70	19	67	−
3	In	76	3	85a	13	60	2
4	Tib	19	26	38	14	50a	5
5	Zr	61	10	76c	23	21	−
6	Sn(IV)	7	20	36 (+29)b,c	22	17	5

^aRef. [34]. ^bA diastereomer of 5a. ^cRef. [37].