Pyrazolo[3,4-<i>b</i>]pyridines: Syntheses, reactions, and nuclear magnetic resonance spectra
作者:Brian Maurice Lynch、Misbahul Ain Khan、Huk Chia Teo、Francisco Pedrotti
DOI:10.1139/v88-074
日期:1988.3.1
2-Chloro-3-formylpyridine (2-chloronicotinaldehyde) was obtained by reduction of 2-chloro-3-cyanopyridine by Raney nickel and formic acid (3 1); this intermediate is inaccessible by the above N-oxidation route (peroxyacid oxidation of 3-formylpyridine yields pyridine-N-oxide 3-carboxylic acid). In the synthesis of the parent 1 from 2-chloro-3-formylpyridine, the yield was prejudiced by the formation
Synthesis of Fused Pyrimidinone and Quinolone Derivatives in an Automated High-Temperature and High-Pressure Flow Reactor
作者:Jennifer Tsoung、Andrew R. Bogdan、Stanislaw Kantor、Ying Wang、Manwika Charaschanya、Stevan W. Djuric
DOI:10.1021/acs.joc.6b02520
日期:2017.1.20
pyrimidinone and quinolone derivatives that are of potential interest to pharmaceutical research were synthesized within minutes in up to 96% yield in an automated Phoenix high-temperature and high-pressure continuous flow reactor. Heterocyclic scaffolds that are either hard to synthesize or require multisteps are readily accessible using a common set of reaction conditions. The use of low-boiling solvents
A series of 4-anilinopyrazolopyridine derivatives were synthesized and biologically evaluated as inhibitors of phosphodiesterase (PDE4). Chemical modification of 3, a structurally new chemical lead that was found in our in-house library, was focused on 1- and 3-substituents. Full details of the discovery of a new orally active chemical lead 5 are presented. Structure–activity relationship data, pharmacological evaluation, and the subtype selectivity study are also presented.
Synthesis and characterization of new 1H-pyrazolo[3,4-b]pyridine phosphoramidate derivatives
作者:Leandro Ferreira Pedrosa、William Pires de Macedo、Antonia Carlene Rodrigues Furtado、Guilherme Pereira Guedes、Julio Cesar Borges、Jackson Antonio Lamounier Camargos Resende、Maria das Graças Fialho Vaz、Alice Maria Rolim Bernardino、Marcos Costa de Souza
DOI:10.3998/ark.5550190.p008.413
日期:——
Twelve new 1 H-pyrazolo[3,4-b]pyridine phosphoramidate derivatives were synthesized under mild conditions by nucleophilic aromatic substitution reaction of aminoalkylphosphoramidates over 4-Cl substituted pyrazolo[3,4-b]pyridine in good yields. The new compounds were characterized by IR, 1 H, 13 C and 31 P NMR spectroscopy and HRMS. The crystal structure of one compound was solved by X-ray diffraction
十二个新的 1 H-吡唑并 [3,4-b] 吡啶氨基磷酸酯衍生物在温和条件下通过氨基烷基氨基磷酸酯在 4-Cl 取代的吡唑并 [3,4-b] 吡啶上的亲核芳香取代反应以良好的产率合成。新化合物通过红外、 1 H、 13 C 和 31 P NMR 光谱和 HRMS 进行了表征。一种化合物的晶体结构通过 X 射线衍射解析,并显示出涉及氨基磷酸酯基团的分子间相互作用网络。
Synthesis and analgesic properties of 5-acyl-arylhydrazone 1-H pyrazolo [3,4-b] pyridine derivatives
作者:Luiza Rosaria S. Dias、Maria JoséF. Alvim、Antonio Carlos C. Freitas、Eliezer J. Barreiro、Ana Luisa P. Miranda
DOI:10.1016/0031-6865(94)90019-1
日期:1994.12
A series of 5-acyl-arylhydrazone1-Hpyrazolo [3,4-b] pyridinederivatives (1), planned by applying classical ring isosterism, were synthesized in order to evaluate the structure-activity relationship (SAR), especially the participation of the structural acyl-arylhydrazone subunit in the analgesia. The synthetic route used produced the derivatives 1 in approximately 40% overall yield, using 9 as key