Spirocyclization of 1‐(o‐aminophenyl)cycloalkanols and 1‐(2′‐amino‐3′‐pyridinyl)cycloalkanols

A one‐step synthesis of spiro[cycloalkane‐1,4′‐2H‐3′,1‐benzoxazin]‐2′‐ones and spiro[cycloalkane‐1,4′‐1H‐pyrido[2′,3′‐d][1,3′]oxazin]‐2′‐ones, obtained in good yield from the corresponding 1‐(o‐aminophenyl) and 1‐(2′‐amino‐3′‐pyridinyl)cycloalkanols is described using ethyl carbonate in presence of n‐butyllithium.