Pyridines and benzopyridines substituted with trimethylsilylmethyl groups, α or γ to the nitrogen atom, have been found to react with formamides by way of a Peterson reaction to form enamines. Trimethylsilylmethylbenzene behaved similarly. The enamines prepared from Nb-formyl-Na,Nb-dimethyltryptamine cyclized readily to β-carbolines. The reaction of formamides with lithiated 4-methylpyridines as a route to enamines was examined but proved to be less general and proceeded in lower yield than the route by way of the Peterson reaction. The nuclear magnetic resonance and mass spectra of the enamines and β-carbolines derived from 3 are discussed.
吡啶和苯并
吡啶取代了三甲基
硅甲基基团,α或γ位于氮原子旁边,已被发现通过Peterson反应与甲酰胺反应形成烯胺。三甲基
硅甲基苯行为类似。从N
b-甲酰-N
a,N
b-二甲基
色胺制备的烯胺很容易环化为β-
咖啡碱。以
锂化的4-
甲基吡啶与甲酰胺反应形成烯胺的途径进行了研究,但证明不如通过Peterson反应途径普遍,并且产率较低。讨论了从3衍生的烯胺和β-
咖啡碱的核磁共振和质谱。