三环1,3-恶嗪-4-酮的合成及胆固醇酯酶和乙酰胆碱酯酶抑制的动力学分析。,Journal of Medicinal Chemistry

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三环1,3-恶嗪-4-酮的合成及胆固醇酯酶和乙酰胆碱酯酶抑制的动力学分析。
Journal of Medicinal Chemistry ( IF 6.8 ) Pub Date : 2005 Dec 29 , DOI: 10.1021/jm0508639
Markus Pietsch ₁ , Michael Gütschow ₁

Affiliation

合成了一系列噻吩并[1,3]恶嗪-4-酮和噻吩并[1,3]噻嗪-4-酮，并研究了它们作为α/β水解酶胆固醇酯酶（CEase）和乙酰胆碱酯酶（AChE）的抑制剂。在噻吩上稠合的脂环族五或六元环的引入有利于抑制CEase。这类化合物被分析为真正的替代底物抑制剂。6,7-二氢-2-（二甲基氨基）-4H，5H-环戊[4,5]噻吩并[2,3-d] [1,3]恶嗪-4-酮（33）的K（i）值630 nM的样品对CEase催化降解的敏感性低。化合物33及其类似物不抑制AChE。在碱性氮原子上带有大的疏水取代基的四氢吡啶环的引入提供了对Chase完全无活性的AChE抑制剂。7-苄基5,6,7,8-四氢-2-（N-3，4-二甲氧基苄基-N-甲基氨基）-4H-吡啶基[4'，3'：4,5]噻吩并[2,3-d] [1,3]恶嗪-4-酮（21）的IC（50）抑制AChE的值为330 nM。得出了在无限抑制剂浓度下的残留酶活性，因此得出了具有催化活性的三元酶-底物-抑制剂复合物。为了指定抑制动力学参数，推导了一种新方法来表征所选的噻吩并[1,3]恶嗪-4-酮为AChE的双曲混合型抑制剂。

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Synthesis of tricyclic 1,3-oxazin-4-ones and kinetic analysis of cholesterol esterase and acetylcholinesterase inhibition.

A series of thieno[1,3]oxazin-4-ones and thieno[1,3]thiazin-4-ones were synthesized and investigated as inhibitors of the alpha/beta hydrolases cholesterol esterase (CEase) and acetylcholinesterase (AChE). The introduction of a cycloaliphatic five- or six-membered ring fused at the thiophene was favorable for CEase inhibition. Such compounds were analyzed as true alternate substrate inhibitors. 6,7-Dihydro-2-(dimethylamino)-4H,5H-cyclopenta[4,5]thieno[2,3-d][1,3]oxazin-4-one (33) exhibited a K(i) value of 630 nM and excelled in its low susceptibility to CEase-catalyzed degradation. Compound 33 and its analogues did not inhibit AChE. The introduction of a tetrahydropyrido ring with bulky hydrophobic substituents at the basic nitrogen provided inhibitors of AChE which were completely inactive toward CEase. 7-Benzyl-5,6,7,8-tetrahydro-2-(N-3,4-dimethoxybenzyl-N-methylamino)-4H-pyrido[4', 3':4,5]thieno[2,3-d][1,3]oxazin-4-one (21) had the IC(50) value of 330 nM for AChE inhibition. A residual enzymatic activity at an infinite inhibitor concentration and thus a catalytically active ternary enzyme-substrate-inhibitor complex was concluded. To specify kinetic parameters of inhibition, a new method was derived to characterize selected thieno[1,3]oxazin-4-ones as hyperbolic mixed-type inhibitors of AChE.

更新日期：2017-01-31

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