A convenient preparative method was developed for the synthesis of 4-amino-3-furoxancarboxylic acid azide, which is a universal synthon for the preparation of functional furoxan derivatives. This method was used for preparing new azo-, azoxy-, azido-, cyano-, nitro-, carbonylamino-, and hydroxylamino-substituted furoxan derivatives, which have earlier been difficultly accessible.
?-hydroaxyalkyl(benzyl)furozans and ?-hydroxyalkyl(benzyl)furoxans synthesis and reactivity
摘要:
A general,and simple preparative method for the synthesis of alpha-hydroxyalkyl(benzyI)furazan and -furoxan derivatives is proposed. The method involves reduction of acyl or ethoxycarbonyl substituents in these heterocyclic compounds with NaBH4 in ethanol. Based on the alcohols thus prepared, a number of previously unknown functional derivatives (alpha-nitroxyalkyl-,alpha-haloalkyl-, and alpha-azidoalkylfurazans and -furoxans) have been synthesized.