Table 2.

RuCl₃·3H₂O-catalyzed reaction of indoles with aldehydes ^a.

Entry	Compounds	R1	R2	Time/h	Yield [%] b
1	2a	H	H	0.5	92
2	2b	m-CH3	H	1	77
3	2c	p-CH3	H	1	83
4	2d	m-OCH3	H	1	81
5	2e	m-Cl	H	0.5	93
6	2f	o-Br	H	0.5	89
7	2g	m-NO2	H	0.5	98
8	3a	H	N-CH3	1	75
9	3b	m-CH3	N-CH3	1	70
10	3c	p-CH3	N-CH3	1	70
11	3d	m-OCH3	N-CH3	1	73
12	3e	m-Cl	N-CH3	1	81
13	3f	o-Br	N-CH3	1	78
14	3g	m-NO2	N-CH3	1	85
15	4a	m-CH3	2-CH3	0.5	80
16	4b	m-OCH3	2-CH3	0.5	78

^a The reaction was performed with aldehyde (0.5 mmol), indole (1 mmol) and RuCl₃·3H₂O (0.05 mmol) in 1 mL of benzene at rt. ^b Isolated yield.