Abstract
Nucleophilic addition of methyl 3‐aminothiophene‐2‐carboxylate (2) as well as of β‐alanine ethyl ester (11) to one CN group of the salts 1 of alkyl dicyanoacetates, followed by cyclization, yielded 1,2,3,4‐tetrahydro‐4‐oxothieno[3,2‐d]pyridimine derivatives 6–10 (Scheme 1) and perhydropyrimidine derivatives 17–19 (Scheme 2), respectively.