作者:V. V. Dotsenko、S. G. Krivokolysko、E. B. Rusanov、V. P. Litvinov
DOI:10.1007/s11172-007-0218-6
日期:2007.7
Reactions of 6-aryl-5-cyano-4-oxo-2-thioxo-1,2,3,4-tetrahydropyrimidines with formaldehyde and primary amines gave earlier unknown 3,4-dihydro-2H,6H-pyrimido[2,1-b]-[1,3,5]thiadiazine derivatives in 58–94% yields. In boiling AcOH, these pyrimidothiadiazines underwent the retro-Mannich reaction leading to the starting pyrimidine-2-thiones. The structure of 3-(4-ethoxyphenyl)-6-oxo-8-phenyl-3,4-dihydro-2H,6H-pyrimido[2,1-b][1,3,5]thiadiazine-7-carbonitrile was studied by X-ray diffraction analysis.
6- 芳基-5-氰基-4-氧代-2-硫酮-1,2,3,4-四氢嘧啶与甲醛和伯胺反应,得到了早期未知的 3,4-二氢-2H,6H-嘧啶并[2,1-b]-[1,3,5]噻二嗪衍生物,产率为 58-94%。在沸腾的 AcOH 中,这些嘧啶并噻二嗪发生了逆-曼尼希反应,生成了起始的嘧啶并噻二嗪。通过 X 射线衍射分析研究了 3-(4-乙氧基苯基)-6-氧代-8-苯基-3,4-二氢-2H,6H-嘧啶并[2,1-b][1,3,5]噻二嗪-7-甲腈的结构。