To provide a method whereby a 2-azaadamantane can easily be obtained in good yield.
A method for producing a 2-azaadamantane represented by the formula (1), which comprises cyclizing a compound represented by the following formula (2) in the presence of an acid.
The acidolysis of 3-endo-azidomethylbicyclo[3.3.1]non-6-ene (3) with methanesulphonic acid gave 4-azahomoadamant-4-ene (5) which was also produced from 3-endo-hydroxymethylbicyclo[3.3.1]non-6-ene (6) on treatment with NaN3–MeSO3H. The formation of (5) was rationalized by a π route cyclization followed by acidolytic ring expansion of intermediate azides on the basis of acidolysis of dideuterio-derivatives