Notizen. Oxazolo[5,4‐b]pyridine durch Photoumlagerung von Isoxazolo[5,4‐b]pyridinen

Preparation of Oxazolo[5,4‐b]pyridines by Photorearrangement of Isoxazolo[5,4‐b]pyridines Oxazolo[5,4‐b]pyridines ( 4 ) are prepared with yields of about 50% by photorearrangement of isoxazolo[5,4‐b]pyridines ( 1 ) which are readily available from 5‐aminoisoxazoles and 3‐ethoxy‐acroleins.