Table 8. SMA catalysed multicomponent synthesis of 3a–j^a.

Entry	R	Timeb (min)	Product	Yieldc (%)	M.P. (°C) (observed)	M.P. (°C) (reported)
1	–C6H5	10	3a	90	235–237	236–238 (ref. 35)
2	4-ClC6H4	15	3b	94	234–236	234–236 (ref. 35)
3	4-OHC6H4	16	3c	83	210–213	210–213 (ref. 36)
4	4-FC6H4	14	3d	89	253–255	254–256 (ref. 35)
5	4-BrC6H4	15	3e	92	244–246	243–245 (ref. 35)
6	4-MeC6H4	10	3f	80	224–226	240–242 (ref. 35)
7	2-OMe, 5-OMeC6H3	15	3g	82	221–223	223 (ref. 37)
8	3-OMe, 4-OMe, 5-OMeC6H2	20	3h	81	229–231	230–232 (ref. 34)
9	2-ClC6H4	12	3i	91	237–239	237–239 (ref. 35)
10	3-BrC6H4	14	3j	90	241–243	242–244 (ref. 35)

^aReaction condition: aldehyde (1 mmol), malononitrile (1 mmol), 2-aminobenzimidazole (1 mmol) and SMA (1 mol%).

^bReaction progress monitored by TLC.

^cIsolated yield.