Development of Orally Active Oxytocin Antagonists: Studies on 1-(1-{4-[1-(2-Methyl-1-oxidopyridin-3-ylmethyl)piperidin-4-yloxy]-2- methoxybenzoyl}piperidin-4-yl)-1,4-dihydrobenz[<i>d</i>][1,3]oxazin-2-one (L-372,662) and Related Pyridines
作者:Ian M. Bell、Jill M. Erb、Roger M. Freidinger、Steven N. Gallicchio、James P. Guare、Maribeth T. Guidotti、Rita A. Halpin、Doug W. Hobbs、Carl F. Homnick、Michelle S. Kuo、Edward V. Lis、David J. Mathre、Stuart R. Michelson、Joseph M. Pawluczyk、Douglas J. Pettibone、Duane R. Reiss、Stanley Vickers、Peter D. Williams、Carla J. Woyden
DOI:10.1021/jm9800797
日期:1998.6.1
The previously reported oxytocin antagonist L-371,257 (2) has been modified at its acetylpiperidine terminus to incorporate various pyridine N-oxide groups. This modification has led to the identification of compounds with improved pharmacokinetics and excellent oral bioavailability. The pyridine N-oxide series is exemplified by L-372,662 (30), which possessed good potency in vitro (Ki = 4.1 nM, cloned
先前报道的催产素拮抗剂L-371,257(2)在其乙酰基哌啶末端进行了修饰,以结合各种吡啶N-氧化物基团。这种修饰导致鉴定出具有改善的药代动力学和优异的口服生物利用度的化合物。吡啶N-氧化物系列的实例为L-372,662(30),在体外和体内(大鼠体内静脉AD50 = 0.71 mg / kg)(Ki = 4.1 nM,克隆的人催产素受体)均具有良好的效价。口服生物利用度(在大鼠中为90%,在狗中为96%),良好的水溶解度(在pH 5.2下> 8.5 mg / mL)应有利于静脉内给药的制剂以及对人精氨酸加压素受体的优异选择性。在这类催产素拮抗剂中,在中央苯甲酰基环上引入5-氟取代基可增强体外和体内效能,但不利于这些化合物的药代动力学。尽管在化合物30的吡啶环周围的亲脂取代在体外具有更高的亲和力,但是这种取代基是代谢缺陷,并导致体内的不足。研究了两种防止这种新陈代谢的方法,即增加循环限制和