There is described 1,8-naphthyridin-2(1H)-one compounds with bronchodilating and hypotensive properties prepared by reaction of 2,6-diaminopyridine with an appropriate .beta.-diketone providing a 2-aminonaphthyridine compound which upon treatment with nitrous acid is converted to the 2-oxo product. Alternatively, an appropriate .beta.-diketone can be reacted with an alkyl alkoxycarbonylacetimidate, the alkyl 2-aminonicotinate thus formed converted to the hydrazide, which upon treatment with a sulfonyl halide forms the N-sulfonyl hydrazide derivative. This intermediate is reacted with an alkali metal carbonate to provide the 2-aminonicotinaldehyde which upon reaction with an ester of a substituted aliphatic carboxylic acid provides the desired product. In some cases the aminonicotinaldehyde is generated in situ in the presence of the ester thereby giving the desired product in one step from the N-sulfonyl hydrazide derivative.
A 4-acylaminopyrazole derivative represented by the following general formula:
wherein R1 is a hydrogen atom, an optionally substituted C1-C16 alkyl group or the like,
R2 and R3 are independently a hydrogen atom, a halogen atom, an optionally substituted C1-C6 alkyl group or the like,
R4 is a hydrogen atom, a C1-C6 alkyl group or a cyano group,
Z is an oxygen atom or a sulfur atom,
Ar is an optionally substituted C6-C14 aryl group or an optionally substituted 5-6 membered unsaturated heterocyclic group,
B is a hydrogen atom, a halogen atom, an optionally substituted C1-C16 alkyl group or the like.
由以下通式代表的 4-酰氨基吡唑衍生物:
其中 R1 是氢原子、任选取代的 C1-C16 烷基或类似基团、
R2 和 R3 独立地为氢原子、卤素原子、任选取代的 C1-C6 烷基或类似基团、
R4 是氢原子、C1-C6 烷基或氰基、
Z 是氧原子或硫原子、
Ar 是任选取代的 C6-C14 芳基或任选取代的 5-6 位元不饱和杂环基团、
B 是氢原子、卤素原子、任选取代的 C1-C16 烷基或类似基团。
Hellmann,H.; Dieterich,D., Justus Liebigs Annalen der Chemie, 1960, vol. 632, p. 73 - 85
作者:Hellmann,H.、Dieterich,D.
DOI:——
日期:——
Synthesis and Structure–Activity Relationship (SAR) of (5,7-Disubstituted 3-phenylsulfonyl-pyrazolo[1,5-<i>a</i>]pyrimidin-2-yl)-methylamines as Potent Serotonin 5-HT<sub>6</sub> Receptor (5-HT<sub>6</sub>R) Antagonists
作者:Alexandre V. Ivachtchenko、Elena S. Golovina、Madina G. Kadieva、Volodymyr M. Kysil、Oleg D. Mitkin、Sergey E. Tkachenko、Ilya M. Okun
DOI:10.1021/jm201079g
日期:2011.12.8
Syntheses, biological evaluation as 5-HT6 receptor (5-HT6R) antagonists, and structure activity relationships for a series of novel 5,7-disubstituted (3-arylsulfonyl-pyrazolo[1,5-a]pyrimidins are disclosed. The molecule conformational flexibility in the series is restricted by formation of the intramolecular hydrogen bond between 3-sulfo and 2-methylamino groups, which renders high potency and high selectivity to block serotonin-induced responses in HEK-293 cells stably expressing human 5-HT6R. In this work, we tested the hypothesis if addition of a positively ionizable group (PI) to the pyrimidine ring of the scaffold members in positions 5, 6, or 7 could further increase their 5HT(6)R blocking potency. We show that the presence of the PI group with small substituents does not substantially affect either potency or selectivity of the ligands while causing substantial changes in their cLogP values. This provides a possibility for designing of the 5HT(6)R ligands with modified ADME characteristics without grossly affecting efficiency of their interaction with the receptor. In respect to the structure-activity relationship (SAR), among other physiochemical parameters, only the molecule size and shape (described by gyration radii) showed a clear tendency for more compact molecules to be more potent antagonists of this receptor.
Hellmann,H. et al., Justus Liebigs Annalen der Chemie, 1962, vol. 656, p. 70 - 78