Acetylation of a heterocyclic enaminonitrile: Unambiguous structural assignment using NMR methods

Using a combination of nmr techniques, the structure of the acetylation product of methyl 3‐[2‐amino‐3‐cyano‐9‐methoxy‐4H‐5,6‐dihydronaphtho[1,2‐b]pyran‐4‐yl] benzoate 2b has been shown to be the N‐acetyl derivative 5a, rather than the rearranged 2‐acetoxydihydropyridine 6a.