Electrophilic formamidines. Organometallic addition to 2-methoxy pyrrolidine or piperidine N-t-butyl formamidines. Formation of 2-substituted pyrrolidines and piperidines

Article abstract of DOI:10.1016/S0040-4039(00)97716-5

The title compounds were prepared by addition of Grignard reagents to methoxyformamidines 6 and 8 in ether at room temperature. Hydrolysis gives the free secondary amines, or in cases of volatile products, their thiourea derivatives.