Design and Synthesis of Pyrrolidine-5,5‘-trans-Lactams (5-Oxo-hexahydropyrrolo[3,2-b]pyrroles) as Novel Mechanism-Based Inhibitors of Human Cytomegalovirus Protease. 4. Antiviral Activity and Plasma Stability
摘要:
A series of chiral, (S)-proline-alpha-methylpyrrolidine-5,5-trans-lactam serine protease inhibitors has been developed as antivirals of human cytomegalovirus (HCMV). The SAR of the functionality on the proline nitrogen has shown that derivatives of para-substituted phenyl ureas > para-substituted phenyl sulfonamides > para-substituted phenyl carboxamide for activity against HCMV deltaAla protease, producing para-substituted phenyl ureas with single figure nM potency (K-i) against the viral enzyme. The. SAR of the functionality on the lactam nitrogen has defined the steric and electronic requirements for high human plasma stability while retaining good activity against HCMV protease. The combination of high potency against HCMV deltaAla protease and high human plasma stability has produced compounds with significant in vitro antiviral activity against human cytomegalovirus with the 6-hydroxymethyl benzothiazole derivative 72 being equivalent in potency to ganciclovir. The parent benzothiazole 56 had good pharmacokinetics in dogs with 29% bioavailability and good brain and ocular penetration in guinea pigs.
Design and Synthesis of Pyrrolidine-5,5‘-trans-Lactams (5-Oxo-hexahydropyrrolo[3,2-b]pyrroles) as Novel Mechanism-Based Inhibitors of Human Cytomegalovirus Protease. 4. Antiviral Activity and Plasma Stability
摘要:
A series of chiral, (S)-proline-alpha-methylpyrrolidine-5,5-trans-lactam serine protease inhibitors has been developed as antivirals of human cytomegalovirus (HCMV). The SAR of the functionality on the proline nitrogen has shown that derivatives of para-substituted phenyl ureas > para-substituted phenyl sulfonamides > para-substituted phenyl carboxamide for activity against HCMV deltaAla protease, producing para-substituted phenyl ureas with single figure nM potency (K-i) against the viral enzyme. The. SAR of the functionality on the lactam nitrogen has defined the steric and electronic requirements for high human plasma stability while retaining good activity against HCMV protease. The combination of high potency against HCMV deltaAla protease and high human plasma stability has produced compounds with significant in vitro antiviral activity against human cytomegalovirus with the 6-hydroxymethyl benzothiazole derivative 72 being equivalent in potency to ganciclovir. The parent benzothiazole 56 had good pharmacokinetics in dogs with 29% bioavailability and good brain and ocular penetration in guinea pigs.
Design and Synthesis of Pyrrolidine-5,5-<i>trans-</i>lactams (5-Oxohexahydropyrrolo[3,2-<i>b</i>]pyrroles) as Novel Mechanism-Based Inhibitors of Human Cytomegalovirus Protease. 2. Potency and Chirality
作者:Alan D. Borthwick、Andrew J. Crame、Peter F. Ertl、Anne M. Exall、Terry M. Haley、Graham J. Hart、Andrew M. Mason、Andrew M. K. Pennell、Onkar M. P. Singh、Gordon G. Weingarten、James M. Woolven
DOI:10.1021/jm0102203
日期:2002.1.1
The stereospecific synthesis of a series of alpha-methylpyrrolidine-5,5-trans-lactam inhibitors of human cytomegalovirus (HCMV) protease is described. Examination of the SAR in this series has defined the size and chirality of the alpha-substituent, optimized the acyl substituent on the lactam nitrogen, and defined the steric constraint of this functionality. The SAR of the functionality on the pyrrolidine nitrogen of the trans-lactam has been investigated, and this has led to the discovery of potent serine protease inhibitors that are highly selective for the viral enzyme over the mammalian enzymes elastase, thrombin, and acetylcholine esterase. The mechanism of action of our lead compounds has been established by mass spectrometry, and enzymatic degradation of HCMV deltaAla protease acylated with these inhibitors showed that Ser 132 is the active site nucleophile. The crystal structure of HCMV protease was obtained and used to model the conformationally restricted, chiral (S)-proline-alpha-methyl-5,5-trans-lactams into the active site groove of the enzyme, enabling us to direct and rationalize the SAR in this series. The activity against HCMV deltaAla protease is the greatest with inhibitors based on the dansyl-(S)-proline alpha-methyl-5,5-trans-lactam template, which have low nanomolar activity against the viral enzyme.
Pyrrolidine-5,5-trans-lactams as novel mechanism-based inhibitors of human cytomegalovirus protease. Part 3: potency and plasma stability
作者:Alan D Borthwick、Anne M Exall、Terry M Haley、Deborah L Jackson、Andrew M Mason、Gordon G Weingarten
DOI:10.1016/s0960-894x(02)00294-9
日期:2002.7
Mechanism-based inhibitors of HCMV protease, which Lire stable to human plasma (greater than or equal to20h) and have single-figure potency in the muM range against HCMV protease, have been developed based on the dansylprohne alpha-methyl pyrrolidine-5,5-translactam nucleus. (C) 2002 Elsevier Science Ltd. All rights reserved.