One-pot synthesis of N-substituted 2-methyl-4,5,6,7-tetrahydroindole derivatives

We describe the preliminary results of one-pot syntheses of various N-substituted 2-methyl-4,5,6,7-tetrahydroindole derivatives from 2-(2-bromoallyl)cyclohexanone and the corresponding primary amines in good yields. Aliphatic amines were directly converted to tetrahydroindoles, whereas aromatic amines needed an extra base treatment step to complete the transformation.