Reaction of aminopropanedinitrile 4-methylbenzenesulfonate (aminomalononitrile p-toluenesulfonate (tosylate)) with isothiocyanates
摘要:
Aminopropanedinitrile 4-methylbenzenesulfonate (ammoniopropanedinitrile or aminomalononitrile p-toluenesulfonate (tosylate)) reacts with alkyl and aryl isothiocyanates in 1-methyl-2-pyrrolidinone (NMP) to give 5-amino-2-(alkylamino)-4-cyanothiazoles and 5-amino-2-(arylamino)-4-cyanothiazoles (2,5-diaminothiazole-4-carbonitriles), respectively, which react with amidines or ortho esters to afford 7-amino-2-(alkylamino)thiazolo[5,4-d]pyrimidines and 7-amino-2-amino-2-(arylamino)thiazolo[5,4-d]pyrimidines.