Ethyl-N-cyano-cyanoacetimidat 、 2-甲基哌啶 以
四氢呋喃 为溶剂,
反应 120.0h,
以The reaction product is isolated in the same way as 3-(cyanoimino)-3-(N,N-diethylamino)propionitrile的产率得到3-Cyanimino-3-diethylamino-propannitril
The synthesis of alkyl N-cyano cyanoacetimidates (II) and the action of hydrogen halides on II have been examined. The reaction of alkyl cyanoacetimidates (I) with cyanamide in the presence of a dispersing agent gave II in good yields. The cyclization of II with hydrogen chloride gave a mixture of 4-alkoxy-6-amino-2-chloropyrimidines (IV) and 4-alkoxy-2-amino-6-chloropyrimidines (V), but the addition of a Lewis acid led the cyclization in one specific direction exclusively giving IV. Hydrogen bromide and iodide effected cyclization reversely to give 2-amino-6-bromo-4-hydroxy (alkoxy) pyrimidines (IX, X) and 2-amino-4-hydroxy-6-iodopyrimidine (XII) as main products, respectively.
A process for preparing a 2-R.sub.3 -3-(cyanoimino)-3-(amino)propionitrile which comprises A. reacting a mineral acid addition salt of a 2-cyanoacetimidate of the formula ##STR1## with cyanamide in an organic solvent to form a N,2-dicyanoacetimidate B. REACTING A N,2-dicyanoacetimidate of the formula ##STR2## with an amine of the formula ##STR3## to form a 2-R.sub.3 -3-(cyanoimino)propionitrile of the formula ##STR4## N,2-dicyanoacetimidate compounds are claimed as well.