Abstract 3, 3,-Dialkyl-1-cyano-3, 4-dihydroisoquinolines were prepared by Beckmann defragmentation of ethyl α-(3, 3-dialkyl-3, 4-dihydroisoquinol-1-yl)-α-hydroximinoacetates and they take part in a Ritter reaction to form substituted bis-1, 1′-(3, 4-