Table 1.

Reaction times and yields of 3-hydroxy-3-(2-imino-3-methyl-5-oxoimidazolidin-4-yl)indolin-2-ones (3a-w)

Compd	R1	R2	R3	Method-A		Method-B
				Yield (%)	Time (sec)	Yield (%)	Time (hr)
3a	H	H	H	92	20	80	6
3b	F	H	H	94	30	81	6
3c	Cl	H	H	91	40	78	6
3d	Br	H	H	87	40	75	7
3e	Br	Br	H	89	40	79	8
3f	NO2	H	H	92	40	83	8
3g	H	H	-CH3	88	30	78	7
3h	F	H	-CH3	90	40	76	7
3i	Cl	H	-CH3	86	40	77	8
3j	Br	H	-CH3	85	40	80	8
3k	H	H	-Bz	87	30	72	7
3l	Cl	H	-Bz	91	40	76	7
3m	Br	H	-Bz	88	40	75	8
3n	H	H	4-OCH3 Bz	84	30	70	6
3o	Cl	H	4-OCH3 Bz	85	30	74	8
3p	Br	H	4-OCH3 Bz	83	40	79	8
3q	H	H	4-Cl Bz	92	40	77	7
3r	H	H	4-COOCH3Bz	87	20	75	6
3s	H	H	4-CN Bz	86	40	79	8
3t	H	H	-C6H5	83	30	80	7
3u	H	H	-COCH3	87	30	73	7
3v	Cl	H	-COCH3	85	40	75	8
3w	H	H	-SO2C6H5	89	30	78	6