
Entry	Solvent	Tem. [˚C]	Time [min]	Yield [%]^b
1	H₂O	25	14h	40 ^c
2	H₂O	50	5	75
3	H₂O	50	10	79
4	H₂O	50	15	83
5	H₂O	50	20	83
6	H₂O	75	5	80
7	H₂O	75	10	86
8	H₂O	75	15	89
9	H₂O	75	20	92
10	H₂O	75	30	92
11	H₂O	90	10	88
12	H₂O	90	20	90
13	H₂O	90	30	90
14	EtOH	reflux	20	91
15	MeOH	reflux	20	89
16	Acetone	reflux	20	70
17	DMSO	50	20	85
18	THF	50	20	77
19	CHCl₃	reflux	20	65
20	No solvent	75	20	79
21	No solvent	90	20	82
22	No solvent	90	30	87