Hydrogen-bonded assembly in six closely related pyrazolo[3,4-b]pyridine derivatives; a simple chain, three types of chains of rings and a complex sheet structure
描述了由4-羟基香豆素,醛和5-氨基吡唑/ 5-氨基异恶唑合成新香豆素融合的四环体系的三组分反应。在乙酸存在下,分别在乙腈和二甲基亚砜介质中获得4,7-二氢-1H-吡唑并[3,4- b ]吡啶(4)和吡唑并[3,4- b ]吡啶(5)。反应产生4,5-二氢-1H-吡唑并[3,4- b ]吡啶-6(7 H)-(6)在乙酸-乙醇混合体系中,其中涉及C-O键的裂解。还检查了4-羟基-6-甲基-2H-吡喃-2-酮和1,2-二酮,提供了相应的C-O键裂解产物。机理表明,该反应在乙酸-乙醇混合体系中是可逆的。
Mahdavinia, Gholam Hossein; Rahmati, Abbas, Revue Roumaine de Chimie, 2015, vol. 60, # 11-12, p. 1025 - 1032
作者:Mahdavinia, Gholam Hossein、Rahmati, Abbas
DOI:——
日期:——
Preparation of 6-chloropyrazolo[3,4-b]pyridine-5-carbaldehydes by Vilsmeier–Haack reaction and its use in the synthesis of heterocyclic chalcones and dipyrazolopyridines
Novel 6-chloropyrazolo[3,4-b]pyridine-5-carbaldehydes 5 have been synthesized from the 4,5-dihydropyrazolo[3,4-b]pyridine-6-ones 4 via Vilsmeier-Haack reaction. Further treatment of carbaldehydes 5 with acetophenones 6 and hydrazine hydrate afforded chalcone analogues 7 and dipyrazolo[3,4-6:4',3'e]pyridines 8, respectively. (C) 2010 Elsevier Ltd. All rights reserved.
Enantioselective Synthesis of Pyrazolo[3,4-<i>b</i>]pyridone Derivatives with Antifungal Activities against <i>Phytophthora capsici</i> and <i>Colletotrichum fructicola</i>
作者:Guihua Nie、Jun Sun、Chengli Mou、Kun Tang、Yonggui Robin Chi、Tingting Li