Synthesis of spirooxindole-pyrrolidine 4a–n.

Entry	4a–n	Ar	Yield (%)
1	4a	C6H5	84
2	4b	p-MeC6H4	92
3	4c	p-ClC6H4	80
4	4d	2,4-Cl2C6H3	74
5	4e	p-MeOC6H4	86
6	4f	p-BrC6H4	77
7	4g	p-FC6H4	84
8	4h	m-FC6H4	78
9	4i	m-MeC6H4	85
10	4j	m-BrC6H4	72
11	4k	p-CF3C6H4	76
12	4l	2-Thiophene	94
13	4m	2-Furan	89
14	4n	3,4,5-Tri-MeOC6H2	69