Disclosed are novel A
2B
adenosine receptor antagonists having the structure of Formula I or Formula II:
The compounds are particularly useful for treating asthma, inflammatory gastrointestinal tract disorders, cardiovascular diseases, neurological disorders, and diseases related to undesirable angiogenesis.
A Facile Microwave Induced One-Pot Synthesis of Novel Pyrimido[4,5-<i>d</i>]pyrimidines and Pyrido[2,3-<i>d</i>]pyrimidines under Solvent-Free Conditions
作者:Dipak Prajapati、Mukut Gohain、Baikuntha J. Gogoi、Jagir S. Sandhu
DOI:10.1055/s-2004-825601
日期:——
cycloaddition reactions with various electron deficient substrates to give pyrimido[4,5-d]pyrimidines and pyrido[2,3-d]pyrimidines, after elimination of dimethylamine from the (1:1) cycloadducts and oxidative aromatisation. The reaction gives excellent yields when carried out under microwave irradiation under solvent-free conditions.
Regiospecific one-pot synthesis of pyrimido[4,5-d]pyrimidine derivatives in the solid state under microwave irradiations
作者:Dipak Prajapati、Mukut Gohain、Ashim J. Thakur
DOI:10.1016/j.bmcl.2006.03.088
日期:2006.7
imine oxides 6 to provide novel pyrimido[4,5-d]pyrimidine derivatives of biological significance, after elimination of dimethylamine from the (1:1) cycloadducts and oxidative aromatisation. This procedure provides a convenient method for the direct synthesis of pyrimido[4,5-d]pyrimidines in excellent yields when carried out in the solid state and undermicrowaveirradiations.
Studies on 6-[(dimethylamino)methylene]aminouracil: a facile one-pot synthesis of novel pyrimido[4,5-d]pyrimidine derivatives
作者:Dipak Prajapati、Ashim J. Thakur
DOI:10.1016/j.tetlet.2005.01.047
日期:2005.2
heterocumulenes such as aryl isocyanates and isothiocyanates give rise to novel pyrimido[4,5-d]pyrimidines in excellent yields, after elimination of dimethylamine from the (1:1) cycloadducts and tautomerisation. This procedure provides a convenient method for direct synthesis of pyrimido[4,5-d]pyrimidine derivativesunder thermal conditions.
6-[((二甲基氨基)亚甲基]氨基尿嘧啶1与各种杂枯烯类化合物如芳基异氰酸酯和异硫氰酸酯的反应在从(1:1)中消除二甲胺后,以优异的收率产生了新型的嘧啶并[4,5- d ]嘧啶。 )环加合物和互变异构。该方法提供了在热条件下直接合成嘧啶并[4,5- d ]嘧啶衍生物的简便方法。
An Efficient Regiospecific Synthesis of Highly Functionalized Novel Dihydropyrimido[4,5-<i>d</i>]pyrimidine Derivatives by a Three-Component One-Pot Condensation under Solvent-Free Conditions
作者:Dipak Prajapati、Kalyan Borah、Mukut Gohain
DOI:10.1055/s-2007-970739
日期:——
condensation of 6-[(dimethylamino)methylene]amino uracil, an aldehyde, and ammonium acetate in the presence of acetic acid afforded a one-pot synthesis of biologically significant novel dihydropyrimido[4,5-d]pyrimidinederivatives in high yields under solvent-free conditions.