Table 2.
Yields and structural designs of class II 5″-modified neomycin derivatives
| Compounds | Carboxylic acids or amino acids | Yield (%) | Source of carboxylic acids or amino acids |
|---|---|---|---|
| 5a | heptanoic acid (15) | 88% | Commercially available |
| 5b | palmitic acid (16)- | 63% | Commercially available |
| 5c | stearic acid (17)- | 54% | Commercially available |
| 5d | 2-phenyl-4-quinolinecarboxylic acid (18) | 30% | Commercially available |
| 5e | (S)-Z-4-amino-2-benzyloxybutyric acid (19) | 90% | Ref. 37 |
| 5f | Z-Gly (20) | 27% | Commercially available |
| 5g | Z-l-Ala (21) | 36% | Commercially available |
| 5h | Z-l-Pro (22) | 50% | Commercially available |
| 5i | Z-l-Trp (23) | 67% | Commercially available |
| 5j | Z-l-Ser (24) | 52% | Commercially available |
| 5k | Z-l-Lys (25) | 61% | Commercially available |
| 5l | succinic anhydride (26) | 85% | Commercially available |
| 5m | Z-d-Ala (27) | 69% | Commercially available |
| 5n | Z-d-Ser (28) | 57% | Commercially available |
| 5o | Z-d-Pro (29) | 53% | Commercially available |
| 5p | Z-d-Lys (30) | 25% | Commercially available |
| 5q | Z-Gly-Gly (31) | 42% | Commercially available |