The Mannich reaction in the synthesis of N,S-containing heterocycles 6. New approaches to the synthesis of pyrimido[4,3-b][1,3,5]thiadiazine derivatives
作者:V. V. Dotsenko、S. G. Krivokolysko、V. P. Litvinov
DOI:10.1007/s11172-007-0226-6
日期:2007.7
Aminomethylation of 2,6-diamino-4-aryl-4H-thiopyran-3,5-dicarbonitriles in the Mannich reaction with p-toluidine and formaldehyde unexpectedly gave pyrimido[4,3-b][1,3,5]thiadiazine derivatives. The same compounds were obtained in an independent way involving a multicomponent cascade condensation of aromatic aldehydes, cyanothioacetamide, p-toluidine, and formaldehyde.
2,6-二氨基-4-芳基-4H-噻喃-3,5-二甲腈在曼尼希反应中与对甲苯胺和甲醛的氨基甲基化意外得到嘧啶基[4,3-b][1,3,5]噻二嗪衍生物. 以独立的方式获得了相同的化合物,包括芳香醛、氰硫代乙酰胺、对甲苯胺和甲醛的多组分级联缩合。