2can be pyrrolized to yield3 a, which in turn may be hydrolyzed with HCl to3 b. Acetylation of3 afollowed by a reaction with trifluoroacetic acid (TFA) gives3 e. Elimination of ethanol from3 aor of water from3 eis not possible. Treatment of1 awith pyridine/acetic anhydride andTFAor with acetic acid/acetic anhydride affords4 aand4 b, resp. Reaction of4 bin benzene/p-toluenesulfonic acid for 2 hours yields both ethers5Iand5II, whereas after 6 hours 4-acetyl-4H-1,4-benzoxazine (6) is obtained. The structures of all products are established by chemical and spectroscopic methods.