Kalugin, V. E. published the artcileThe synthesis of 3-cyano-2-(organylamino)thieno[3,2-c]isoquinoline derivatives, Quality Control of 612-13-5, the publication is Russian Chemical Bulletin (2019), 68(3), 588-596, database is CAplus.
A method for the preparation of 3-cyano-2-(organylamino)thieno[3,2-c]isoquinoline derivatives was developed. Alkylation of (2,2-dicyano-1-organylaminovinyl)thiolates with Me 2-(chloromethyl)benzoate or N-substituted 2-(chloromethyl)benzamides with the subsequent treatment of the alkylation products with potassium tert-butoxide gave 3-cyano-2-(organylamino)thieno[3,2-c]isoquinolin-5(4H)-ones. In the case of utilization of (chloromethyl)benzonitrile in this synthesis, 5-amino-3-cyano-2-organylaminothieno[3,2-c]iso-quinolines were obtained.
Russian Chemical Bulletin published new progress about 612-13-5. 612-13-5 belongs to nitriles-buliding-blocks, auxiliary class Organic Pigment, name is 2-(Chloromethyl)benzonitrile, and the molecular formula is C8H6ClN, Quality Control of 612-13-5.
Referemce:
https://en.wikipedia.org/wiki/Nitrile,
Nitriles – Chemistry LibreTexts