Acid catalysed enamine induced transformations of 1,3-dimethyl-5-formyluracil. A unique annulation reaction with enaminones
摘要:
1,3-Dimethyl-5-formyluracil (1) with enaminones, 3-amino-5,5-dimethylcyclohex-2-enone and 3-aminocyclohex-2-enone in CH3CN - TFA (10 : 0.1) gives annulation products pyrimido[4,5-b]quinolin-2,4,6(1H, 3H, 7H)-trione derivatives along with Hantzsch type 1,4-dihydropyridine derivatives. However, 1 with ethyl beta-aminocrotonate and 6-amino-1.3-dimethyluracil, enamine ester and amide respectively, provides subsequent transformation products.
1,3-Dimethyl-5-formyluracil (1) with enaminones, 3-amino-5,5-dimethylcyclohex-2-enone and 3-aminocyclohex-2-enone in CH3CN - TFA (10 : 0.1) gives annulation products pyrimido[4,5-b]quinolin-2,4,6(1H, 3H, 7H)-trione derivatives along with Hantzsch type 1,4-dihydropyridine derivatives. However, 1 with ethyl beta-aminocrotonate and 6-amino-1.3-dimethyluracil, enamine ester and amide respectively, provides subsequent transformation products.