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

Table 3

Comparison study with reported methods.

Entry	Reaction conditions	Catalyst loadings (mol%)	𝑡 (min)	Yield (%)	References
1	p-TSA/ethanol/reflux	10	360	47	—
2	p-TSA/solvent-free/80°C	30	10	93	[4]
3	H2SO4/[bmim][BF4]/80°C	15	30	94	[7]
4	Phosphomolybdic acid-SiO2/100°C	5	30	85	[21]
5	CAN/PEG 400/50°C	5	120	94	[22]
6	p-TSA/grinding/rt	3	2	91	This work