恩他卡朋是儿茶酚-O-甲基转移酶(COMT)的新型抑制剂,可作为左旋多巴疗法的辅助治疗帕金森氏病。但是,口服他卡朋的生物利用度相对较低(29-46%)。在这项研究中,我们制备了更多的恩他卡朋的亲脂性酰基酯和酰氧基酰基酯,酰氧基烷基醚和烷氧基羰基酯,我们将它们评估为增强恩他卡朋口服生物利用度的潜在前药。所有衍生物均符合前药标准,并在人血清中体外释放他卡酮。在大鼠中进一步研究了entacapone的单新戊酰基(1a)和二新戊酰基(1b)酯的口服生物利用度。1b的亲脂性较高(在pH 7.4时,log Papp 4.0),但口服生物利用度较低(F = 0.6%),最可能是由于其低水溶性。在pH 7.4时,entacapone(1a)的单新戊酰基酯的亲脂性(log Papp 0.80)比entacapone(log Papp 0.18)高,同时保持水溶性等于entacapone。但是,与母体药物恩他
The crystal structures of entacapone [(E)-2-cyano-N,N-diethyl-3-(3,4-dihydroxy-5-nitrophenyl)propenamide] and three of its acyl esters were solved. Entacapone, and its monopivaloate and diacetate derivatives, exist in the E-form while its dibenzoate derivative adopts the Z-form in the crystalline state. The ethyl substituents of the E-form are not freely rotating, as demonstrated by the broad signals in the H-1 and C-13 NMR spectra. The rotation barrier for the E-form was defined by the crystal structures, which show that free rotation of the ethyl substituents is blocked by the cyano-group. (C) 2001 Elsevier Science B.V. All rights reserved.
Synthesis and in-vitro/in-vivo evaluation of orally administered entacapone prodrugs
作者:Jukka Leppänen、Jouko Savolainen、Tapio Nevalainen、Markus Forsberg、Juhani Huuskonen、Hannu Taipale、Jukka Gynther、Pekka T Männistö、Tomi Järvinen
DOI:10.1211/0022357011778025
日期:2010.2.18
acyloxyacyl esters, an acyloxyalkyl ether and an alkyloxycarbonyl ester of entacapone, and we have evaluated them as potential prodrugs to enhance the oral bioavailability of entacapone. All the derivatives fulfilled prodrug criteria and released entacapone in human serum in-vitro. The oral bioavailability of monopivaloyl (1a) and dipivaloyl (1b) esters of entacapone were investigated further in rats
恩他卡朋是儿茶酚-O-甲基转移酶(COMT)的新型抑制剂,可作为左旋多巴疗法的辅助治疗帕金森氏病。但是,口服他卡朋的生物利用度相对较低(29-46%)。在这项研究中,我们制备了更多的恩他卡朋的亲脂性酰基酯和酰氧基酰基酯,酰氧基烷基醚和烷氧基羰基酯,我们将它们评估为增强恩他卡朋口服生物利用度的潜在前药。所有衍生物均符合前药标准,并在人血清中体外释放他卡酮。在大鼠中进一步研究了entacapone的单新戊酰基(1a)和二新戊酰基(1b)酯的口服生物利用度。1b的亲脂性较高(在pH 7.4时,log Papp 4.0),但口服生物利用度较低(F = 0.6%),最可能是由于其低水溶性。在pH 7.4时,entacapone(1a)的单新戊酰基酯的亲脂性(log Papp 0.80)比entacapone(log Papp 0.18)高,同时保持水溶性等于entacapone。但是,与母体药物恩他