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. 2023 Jun 9;13:9388. doi: 10.1038/s41598-023-34172-1

Table 2.

Evaluation of various catalyst for the synthesis of pyrazolo[3,4-b]pyridine-5-carbonitriles with UiO-66-NH2/TCT/2-Amino-py@cu.

Entry Catalyst Amount of catalyst Time (min.) Yield (%)
1 UiO-66-NH2/TCT/2-amino-py@Cu(OAc)2 (This work) 15 (mg) 120 85
2 UiO-66-NH245 15 (mg) 180 22
3 UiO-66-NH2/TCT 15 (mg) 180 Trace
4 UiO-66-NH2/TCT/2-amino-py 15 (mg) 150 38
5 Cu(OAc)2 15 (mol%) 180 35
6 ZrCl4 15 (mol%) 180
7 GTBSA55 15 (mg) 120 74
8 N(Et)3 15 (mol%) 180 76
9 [PVI-SO3H]Cl56 15 (mol%) 150 65
10 p-TSA 15 (mol%) 120 45
11 NaOH 15 (mol%) 100 66
12 Pipyridine 15 (mol%) 120 80
13 MIL(100)(Cr)/NHEtN(CH2PO3H2)211,12 15 (mg) 100 74
14 KOH 15 (mol%) 120 70
15 [Py-SO3H]Cl57 15 (mol%) 120 63
16 SSA58,59 15 (mol%) 180 56

Significant values are in [bold].