A Simple and Green Protocol for 2H-Indazolo[2,1-b]phthalazine-triones Using Grinding Method

Table 1

Effect of catalyst amount on the reaction^a.

Entry	Catalyst amount (mol%)	𝑡 (min)	Yield (%)^b
1	—	30	25
2	1	10	63
3	2	10	76
4	3	2	91
5	4	2	90

aReaction conditions: phthalhydrazide (1 mmol), dimedone (1 mmol), and benzaldehyde (1 mmol), ground at room temperature.
^bIsolated yields.