Table 2.
Yields of oxazolo[5,4-b]pyridine 7a by the action of dehydrating reagents on compound 4a
| Reagent | Temperature, °С | Time, h | Yield, % |
|---|---|---|---|
| POCl3 | 25 | 24 | 0 |
| POCl3 | 110 | 1.5 | 40 |
| SOCl2 | 25 | 24 | 0 |
| SOCl2 | 75 | 3 | 34 |
| Ac2O, H2SO4 | 140 | 17 | 10 |
| PPA | 150 | 10 | 0 |
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