One pot multicomponent synthesis of pyrano[2,3-c]pyrazoles by sequential addition strategy using aldehydes, malononitrile and pyarazolinones in water–SDS–[BMIm]Br system.

Entry	Aldehyde	Active methylene	Pyrazolone	Product	Time (mins)	Yield (%)
1					40	96 (ref. 22c)
2					50	95 (ref. 22c)
3					50	94 (ref. 38)
4					70	94 (ref. 22c)
5					70	95 (ref. 22c)
6					60	78 (ref. 27)
7					40	96 (ref. 27)
8					50	94 (ref. 27)
9					50	94 (ref. 39)
10					60	94 (ref. 27)
11					70	94 (ref. 27)
12					60	93 (ref. 27)
13					120	92 (ref. 39)
14					720	87new
15					720	85new
16					60	95 (ref. 40)
17					60	94 (ref. 41)
18					80	93 (ref. 40)