3 H-咪唑并[4,5 - c ]喹啉-4(5 H)-ones作为有效的和选择性的二肽基肽酶IV(DPP-4)抑制剂的发现
摘要:
近年来,二肽基肽酶IV抑制剂被认为是治疗2型糖尿病的有价值的药物。在这里,我们报告发现一种新型有效的DPP-4抑制剂,其3 H-咪唑并[4,5- c ]喹啉4(5 H)-一个为骨架。使用对接研究对前导化合物2a在7位和8位进行高效优化后,我们发现28种新型DPP-4抑制剂具有对各种DPP-4同源物的优异选择性。化合物28与市售DPP-4抑制剂相比,具有较强的DPP-4抑制活性。我们还发现7位羧基可以与Lys554残基相互作用形成盐桥。另外,将羧基引入7位导致活性增强并且降低了hERG通道抑制和诱导的磷脂中毒的风险。在合成具有7个羧基的化合物时,我们在分子内钯偶联反应中使用大体积酯实现了高效的区域选择性合成。
Preparation of 2-aminosubstituted 3H-imidazo[4,5-c]quinolin-4(5H)-ones by palladium-assisted internal biaryl coupling reaction
摘要:
Representatives of the 3H-imidazo[4,5-c]quinolin-4(5H)-ones have shown interesting biological activity. We have found 2-aminosubstituted 3H-imidazo[4,5-c]quinolin-4(5H)-one as a potent dipeptidyl peptidase 4 inhibitor. However effective synthesis of this nucleus with various substituents at the 6-9-positions has not been reported. We report herein the development of a novel and efficient synthesis of 2-aminosubstituted 3H-imidazo[4,5-c]quinolin-4(5H)-ones by palladium-assisted internal biaryl coupling reaction. Our optimization of the reaction conditions revealed that the most important factors for this reaction are use of silver carbonate as a base and high reaction temperature. (C) 2011 Elsevier Ltd. All rights reserved.