The present invention relates to substituted heterocyclic compounds of Formula I or XI:
or pharmaceutically acceptable salts or N-oxides or quaternary ammonium salts thereof wherein constituent members are provided hereinwith, as well as their compositions and methods of use, which are histamine II4 receptor inhibitors useful in the treatment of histamine II4 receptor-associated conditions or diseases or disorders including, for example, inflammatory diseases or disorders, pruritus, and pain.
Benzyne, cyclohexyne, and 3-azacyclohexyne have been obtained by flash vacuum pyrolysis of phthalic anhydride, 4-cyclopentylidene-3-methylisoxazol-5(4H)-one (34), and 3-methyl-4-(2-pyrrolidinylidene)isoxazol-5(4H)-one (37), respectively, isolated at 77 K and observed by IR spectroscopy. Trapping and fragmentation reactions are described, and the implications for the mechanism of benzyne formation from
An efficient and novel multicomponent reaction for synthesis of new isoxazolinedione has been described. This protocol involves reaction of two molecules of isocyanide, aliphatic oxime, alkylidene substituted Meldrum's acid, and water (moisture). Elemental analyses, IR, 1H NMR, and 13C NMR spectroscopic data of products are consistent with the structure defined by X‐ray diffraction analysis.
已经描述了用于合成新的异恶唑啉二酮的有效且新颖的多组分反应。该方案涉及两个异氰酸酯分子,脂肪族肟,亚烷基取代的麦德鲁姆酸和水(水分)的反应。产品的元素分析,IR,1 H NMR和13 C NMR光谱数据与X射线衍射分析所定义的结构一致。
Synthesis of novel furo-pyran derivatives via reaction between an isocyanide and alkylidene-substituted Meldrum’s acid
An unexpected four-component (3+1) reaction of an alkyl isocyanide with alkylidene-substituted Meldrum’s acid in CH2Cl2 at room temperature produces imino-furopyranones in good yields. The structures of the products are deduced from their IR, 1H NMR, and 13C NMR spectra and by X-ray analysis. The products are structurally similar to 2H-furo[2,3-c]pyran-2-one natural products.
室温下,烷基异氰化物与亚烷基取代的麦德鲁姆酸在CH 2 Cl 2中发生意外的四组分(3 + 1)反应,可生成高收率的亚氨基呋喃基吡喃酮。由它们的IR,1 H NMR和13 C NMR光谱以及通过X射线分析推导产物的结构。该产物在结构上类似于2 H-呋喃[2,3 - c ]吡喃-2-酮天然产物。