Table 4.
Biological activities of the synthesized spiro-indoline derivatives 3a–c and 5a–l
| Compounds | R1, R2 | R3 | IC50 | Inhibition zone (mm) B. subtilis |
Inhibition zone (mm) F. moniliforme |
|---|---|---|---|---|---|
| 3a | (C6H5)2 | – | >50 | 12 ± 2 | Nill |
| 3b | (C2H5)2 | – | >50 | 24 ± 2 | 15 ± 2 |
| 3c | Piperidinyl | – | 18.8 | 19 ± 4 | 2 ± 1 |
| 5a | (C6H5)2 | 2-OH | 44.5 | 20 ± 2 | 12 ± 1 |
| 5b | (C6H5)2 | 4-OCH3 | 23.9 | Nill | Nill |
| 5c | (C6H5)2 | 4-Cl | >50 | 24 ± 2 | 10 ± 2 |
| 5d | (C6H5)2 | 4-NO2 | 25.0 | 18 ± 3 | 6 ± 1 |
| 5e | (C2H5)2 | 2-OH | 25.0 | 18 ± 1 | 4 ± 1 |
| 5f | (C2H5)2 | 4-OCH3 | >50 | Nill | Nill |
| 5g | (C2H5)2 | 4-Cl | 11.9 | Nill | Nill |
| 5h | (C2H5)2 | 4-NO2 | 20.9 | 25 ± 3 | 10 ± 1 |
| 5i | Piperidinyl | 2-OH | >50 | 19 ± 3 | Nill |
| 5j | Piperidinyl | 4-OCH3 | 18.8 | 16 ± 2 | 4 ± 2 |
| 5k | Piperidinyl | 4-Cl | >50 | 12 ± 1 | Nill |
| 5l | Piperidinyl | 4-NO2 | 38.3 | 4 ± 1 | Nill |