Reactions of tetrahydropyrido[4,5-d][1,2,4]triazolo[1,5-a]-pyrimidin-4-ones with activated alkynes. Synthesis of [1,2,4]triazolo[1′,5′:1,2]pyrimido[4,5-d]azocines
作者:L. G. Voskressensky、T. N. Borisova、M. V. Ovcharov、E. A. Sorokina、V. N. Khrustalev、A. V. Varlamov
DOI:10.1007/s11172-012-0213-4
日期:2012.8
Triazolo[1′,5′:1,2]pyrimido[4,5-d]azocines were synthesized by the tandem expansion of the tetrahydropyridine ring in tetrahydropyridotriazolopyrimidines by the action of activated alkynes. Under these conditions, triazolopyridopyrimidines benzylated at the nitrogen atom of the pyrimidine moiety undergo the Hofmann cleavage of the tetrahydropyridine ring to form 5-vinyltriazolo[1,5-a]pyrimidines.
三唑并[1′,5′:1,2]嘧啶并[4,5-d]氮杂环辛烷是通过在四氢吡啶三唑并嘧啶中通过活化炔的作用串联扩展四氢吡啶环合成的。在这些条件下,在嘧啶部分的氮原子上苄化的三唑并嘧啶经历四氢吡啶环的霍夫曼裂解,形成5-乙烯基三唑并[1,5-a]嘧啶。