Table 1. Preparation of Schiff Bases 2.
Entry | Compound | R1 | R2 | % Yield | mp, °C | C log Pa | MIC, μg/mLb |
---|---|---|---|---|---|---|---|
1. | 3 | H | 2-(OCH2C6H5)C6H4 | 90 | 185 | 4.57 | 0.06c |
2. | 4 | (CH2)4CH3 | C6H5 | 64 | 116-117 | 4.49 | 0.39 |
3. | 5 | H | 4-BrC6H4 | 91 | 218-219 | 3.84 | 3.13 |
4. | 6 | H | 2-ClC6H4 | 66 | 218-221 | 3.56 | 0.78 |
5. | 7 | H | 3,4-F2C6H3 | 86 | 195-196 | 3.32 | 1.56 |
6. | 8 | H | 4-IC6H4 | 92 | 243 | 4.30 | 0.20 |
7. | 9 | H | 3-I-4,5-(OCH3)2C6H2 | 90 | 234 | 3.80 | 0.20 |
8. | 10 | H | 3-I-4-OH-5-OCH3C6H2 | 87 | 221 | 3.76 | 0.39 |
9. | 11 | H | 4-ClC6H5 | 94 | 215-216 | 3.56 | 0.20 |
10. | 12 | H | 3,4-Cl2C6H3 | 88 | 241-244 | 4.08 | 0.20 |
11. | 13 | H | 2,6-F2C6H3 | 100 | 239 | 3.32 | 0.10 |
12. | 14 | H | 2,3-Cl2C6H3 | 98 | 227 | 4.08 | 0.78 |
13. | 15 | H | 2,6-Cl2C6H3 | 97 | semisolid | 4.08 | <6.25 |
14. | 16 | H | 2-NO2C6H4 | 97 | 230 | 1.06 | 0.39 |
15. | 17 | H | 4-Cl-3-NO2C6H3 | 100 | 231 | 1.58 | 0.39 |
16. | 18 | CH3 | C6H5 | 92 | 169-170 | 2.68 | <6.25 |
17. | 19 | H | 4-CH3(CH2)5OC6H4 | 87 | 135-138 | 5.49 | 0.39 |
18. | 20 | H | 3-NO2C6H4 | 85 | 225 | 1.06 | 0.125c |
19. | 21 | H | C6H5 | 98 | 197 | 3.04 | 0.05 |
20. | 22 | H | 4-CH3(CH2)3OC6H4 | 91 | 148-149 | 4.00 | 0.10 |
21. | 23 | H | t-CH=CHCH2CH3 | 54 | 161-164 | 2.24 | 0.05 |
22. | 24 | H | t-CH=CHCH3 | 73 | 198-201 | 1.85 | <6.25 |
23. | 25 | H | t-CH=CHCH2CH2CH3 | 93 | 152-154 | 2.64 | <6.25 |
24. | 26 | H | t-CH=CH(CH2)3CH3 | 84 | 152-154 | 3.03 | <6.25 |
25. | 27 | H | C=CCH3CH2CH2CH=CH2 | 59 | 124-125 | 2.97 | 0.10 |
26. | 28 | H | CH2CHCH3CH2CH2CH=C(CH3)2 | 29 | 78-80 | 3.58 | 0.20 |
27. | 29 | CH3 | CH3 | 48 | 161-162 | 1.70 | 0.10 |
28. | 30 | CH2Ph | CH2CO2CH2CH3 | 90 | 104 | 3.78 | 0.10 |
29. | 31 | R1R2 = CCH2CH(CH3)CH2C(CH3)2CH2 | 76 | 149-151 | 3.94 | <0.025 | |
30. | 32 | H | CH=C(C6H5)2 | 86 | 223 | 4.43 | 0.10 |
31. | 33 | H | t-CH=CH-4-OCH3C6H4 | 89 | 218 | 2.73 | 0.20 |
32. | 34 | H | t-CH=CH-2-NO2C6H4 | 94 | 204 | 1.08 | 0.25c |
33. | 35 | H | C(n-C3H7)=CH(CH2)3CH3 | 84 | 121 | 4.10 | 0.50 |
34. | 36 | H | C(i-C3H7)=CHCH2CH(CH3)2 | 99 | 129 | 3.97 | 0.06c |
35. | 37 | H | t-CH=CH-2-OCH3C6H4 | 92 | 206 | 2.81 | 0.10 |
36. | 38 | H | t-CCH3=CHC6H5 | 90 | 200 | 3.34 | 0.50 |
37. | 39 | H | CH=NNHCOC5H4N | 90 | >300 (d)d | 1.58 | 0.10 |
38. | 40 | CH2CH2CH3 | CH2CO2CH2CH3 | 98 | 89-90 | 2.96 | 0.39 |
39. | 41 | CH3 | CH2CO2CH2CH3 | 85 | 99 | 1.93 | 0.20 |
40. | 42 | H | 4-(CH=NNHCOC5H4N)C6H4 | 90 | >300 (d)d | 4.04 | 0.05 |
41. | 43 | CH2CH2C6H5 | CO2CH2CH3 | 90 | 104 | 4.24 | 0.10 |
42. | 44 | H | CH3(CH2)11CH2 | 73 | 89-91 | 5.73 | 0.20 |
43. | 45 | H | CH3(CH2)10CH2 | 73 | 92-93 | 5.33 | 0.20 |
44. | 46 | R1R2 = C(CH2CH2)2CH2 | 81 | 167-168 | 2.85 | 0.03 |
Calculated using HyperChem Pro, Version 7.5. For INH, C log P is 0.49.
MIC90 against M. tuberculosis strain H37Rv, unless otherwise noted. MIC INH control 0.03-0.06 μg/mL.
MIC90 against M. tuberculosis strain Erdman. MIC INH control 0.03-0.06 μg/mL. MIC PAS control 0.03-0.06 μg/mL.
Decomposed without melting.