Quinoxalinyl macrocyclic hepatitis C serine protease inhibitors
申请人:——
公开号:US20040266668A1
公开(公告)日:2004-12-30
The present invention relates to compounds of Formula I or II, or a pharmaceutically acceptable salt, ester, or prodrug, thereof:
1
which inhibit serine protease activity, particularly the activity of hepatitis C virus (HCV) NS3-NS4A protease. Consequently, the compounds of the present invention interfere with the life cycle of the hepatitis C virus and are also useful as antiviral agents. The present invention further relates to pharmaceutical compositions comprising the aforementioned compounds for administration to a subject suffering from HCV infection. The invention also relates to methods of treating an HCV infection in a subject by administering a pharmaceutical composition comprising the compounds of the present invention.
There are provided novel compounds of formula (I) wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, R
8
, R
9
, L
1
, L
2
, L
3
and Q are are as defined in the specification, and pharmaceutically acceptable salts thereof; together with processes for their preparation, compositions containing them and their use in therapy. The compounds are inhibitors of nitric oxide synthase and are thereby particularly useful in the treatment or prophylaxis of inflammatory disease and pain.
A new cyclic lipopeptide aciculitin D (1) was isolated from a Poecillastra sp. marine sponge collected in the deep-sea. The structure of aciculitin D (1) was elucidated by spectroscopic analyses and chemical degradation. With regard to amino acid sequence, aciculitin D is different from aciulitin B in one residue substitution of L-Gln for L-Thr. However, absoluteconfigurations of some of the residues
从Poecillastra sp.中分离出一种新的环状脂肽 aciculitin D ( 1 )。在深海中收集的海绵。通过光谱分析和化学降解阐明了aciculitin D( 1 )的结构。就氨基酸序列而言,aciulitin D与aciulitin B的不同之处在于L-Gln对L-Thr的一个残基取代。然而,两种化合物之间某些残基的绝对构型不同。Aciculitin D ( 1 ) 对 HeLa 和 HCT-116 细胞具有细胞毒性,IC 50值分别为 4.5 μM 和 1.4 μM。
Simple and efficient synthesis of allo- and threo-3,3′-dimethylcystine derivatives in enantiomerically pure form
作者:R.B. Nasir Baig、V. Sai Sudhir、Srinivasan Chandrasekaran
DOI:10.1016/j.tetasy.2008.06.001
日期:2008.6
A simple and efficient method for the synthesis of allo- and threo-3,3'-dimethylcystine derivatives is reported. Various tosyl and bromo derivatives of Cbz-, Boc-, and Fmoc- Protected threonine rnethyl esters have been prepared and subjected to nucleophilic substitution with potassium thiocyanate in acetonitrile to yield the corresponding thiocyanate derivatives in moderate yield. The thiocyanates are readily converted to the corresponding allo- and threo-3,3'-dimethylcystine derivatives via reductive dimerization with benzyltriethylammonium tetrathiomolybdate. (C) 2008 Elsevier Ltd. All rights reserved.
Rationally Designed Amanitins Achieve Enhanced Cytotoxicity
作者:Mihajlo Todorovic、Paul Rivollier、Antonio A. W. L. Wong、Zhou Wang、Alla Pryyma、Tuan Trung Nguyen、Kayla C. Newell、Juliette Froelich、David M. Perrin