Pyrano[4,3-d]pyrimidinium salts 3. Reactions of 1,3-dimethyl-2,4-dioxo-1H,3H-pyrano[4,3-d]pyrimidinium salts with azomethines
作者:V. V. Kostrub、E. B. Tsupak
DOI:10.1007/s11172-009-0196-y
日期:2009.7
Reactions of 1,3-dimethyl-2,4-dioxo-1H,3H-pyrano[4,3-d]pyrimidinium salts with azomethines have been studied. The reactions lead to 1,3-dimethyl-2,4-dioxo-1H,3H-pyrido-[4,3-d]pyrimidinium salts and aromatic aldehydes.
Pyrano[4,3-d]pyrimidinium salts 4. Transformations of 5,7-diaryl-1,3-dimethyl-2,4-dioxo-1H,3H-pyrano[4,3-d]pyrimidinium bromides under the action of phenylhydrazines and aromatic acid hydrazides
作者:V. V. Kostrub、E. B. Tsupak、A. F. Smol’yakov
DOI:10.1007/s11172-009-0197-x
日期:2009.7
3-d]pyrimidinium bromides with phenylhydrazines and aromatic acid hydrazides have been studied. The reaction of the salts indicated with phenylhydrazine at ∼20 °C results in the pyrylium ring opening, whereas elevated temperature leads to recyclization products, i.e., 1,3-dimethylpyrido[4,3-d]pyrimidine-2,4(1H,3H)-diones. The reactions of the starting bromides with m-carboxyphenylhydrazine and aromatic acid hydrazides
已经研究了 5,7-二芳基-1,3-二甲基-2,4-二氧代-1H,3H-吡喃并[4,3-d]嘧啶鎓溴化物与苯肼和芳香酰肼的反应。表明盐与苯肼在 20 °C 下反应导致pyrylium 开环,而升高的温度导致再循环产物,即 1,3-二甲基吡啶并[4,3-d]嘧啶-2,4(1H, 3H)-二酮。起始溴化物与间羧基苯肼和芳香酰肼反应生成 6-(R-氨基)-1,3-二甲基-2,4-二氧代-1H,3H-吡啶并[4,3-d]-嘧啶鎓盐。
Synthesis of 1,3-dimethyl-2,4-dioxo-1H,2H,3H,4H-quinazolines and 1,5-dihydro-1,3-dimethyl-5-nitromethyl-2H- pyrano[4,3-d]pyrimidine-2,4(3H)-diones
作者:Vladimir V. Kostrub、Evgeny B. Tsupak、Yulia V. Nelyubina
DOI:10.1016/j.mencom.2009.07.016
日期:2009.7
5,7-Diaryl-1,3-dimethyl-2,4-dioxo-1H,2H,3H,4H-pyrano[4,3-d]pyrimidinium bromides react with malonodinitrile to form 1,3-dimethyl-2,4-dioxo-1H,2H,3H,4H-quinazolines, whereas their reaction with nitromethane gives dihydro-1,3-dimethyl-5-nitromethyl-2H-pyrano[4,3-d]pyrimidine-2,4(3H)-diones, the structure of one of them was established by X-ray analysis.