Research Article
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%) | (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 |
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