Table 2. Optimization of the Synthesis of BIM 1 by the Reaction of 1 mmol of Indole with 0.6 mmol of Benzaldehyde at Various Conditions.

entry	catalyst	catalyst amount (mg)	temperature (°C)	solvent	yield (%)a
1	PPhn@CH2Br	5	25	neat	25
2	PPy@CH2Br	5	25	neat	40
3	PPhn@CH2Br	10	25	neat	50
4	PPy@CH2Br	10	25	neat	73
5	PPhn@CH2Br	10	40	neat	75
6	PPhn@CH2Br	10	60	neat	85
7	PPy@CH2Br	10	40	neat	83
8	PPy@CH2Br	10	60	neat	96
9	Phn	10	40	neat	20
10	Py	10	40	neat	25
11	PPhn–C	10	25	neat	nrb
12	PPy–C	10	25	neat	nr
13	PPy@CH2OMe	10	25	neat	35
14	PPy@CH2OMe	10	60	neat	68
15	PPy@CH2Br	10	60	H2O	50
16	PPy@CH2Br	10	100	H2O	50
17	PPy@CH2Br	10	60	PEG-400	51
18	PPy@CH2Br	10	60	glycerol	48
19	PPy@CH2Br	10	60	EG	45
20	PPy@CH2Br	10	60	toluene	88
21	PPy@CH2Br	10	60	benzene	86

^aIsolated yields.

^bNo reaction.