Table 3.

Synthesis of 1-aryl-2-iminopiperidines 4.

Entry	Compound 4	Ar	Yield (%)
1	a	4-CH3C6H4	74
2	b	C6H5	79
3	c	4-ClC6H4	72
4a	d	2-CH3C6H4	74
5	e	2-FC6H4	82
6a	f	2-ClC6H4	73
7b	g	2,6-(CH3)2C6H4	86

^aThe reaction time was 40 minutes. ^bThis reaction was carried out at 200 °C.