P1 Phenethyl peptide boronic acid inhibitors of HCV NS3 protease
摘要:
A series of peptide boronic acids containing extended, hydrophobic P1 residues was prepared to probe the shallow, hydrophobic S1 region of HCV NS3 protease. The p-trifluoromethylphenethyl P1 substituent was identified as optimal with respect to inhibitor potency for NS3 and selectivity against elastase and chymotrypsin. (C) 2002 Published by Elsevier Science Ltd.
Hydroboration of Alkenes Catalysed by a Nickel N‐Heterocyclic Carbene Complex: Reaction and Mechanistic Aspects
作者:Franck Ulm、Yann Cornaton、Jean‐Pierre Djukic、Michael J. Chetcuti、Vincent Ritleng
DOI:10.1002/chem.202000289
日期:2020.7.22
3‐dimesitylimidazol‐2‐ylidene) efficiently catalyses the anti‐Markovnikov hydroboration of alkenes with catecholborane in the presence of a catalytic amount of potassium tert‐butoxide, and joins the very exclusive club of nickel catalysts for this important transformation. Interestingly, the regioselectivity can be reversed in some cases by using pinacolborane instead of catecholborane. Mechanistic investigations involving
additions of catecholborane across alkynes. Dimethyltitanocene leads to predominantly anti-Markovnikov regiochemistry with alkyl-substituted olefins, and exclusive anti-Markovnikov regiochemistry with vinylarenes. Two titanium(III) complexes, Cp2Ti(H2Bcat) and Cp2Ti(Bcat2), were isolated from the reaction mixtures. These Ti(III) complexes, as well as [Cp2TiH]2 and [Cp2TiMe]2, catalyze the addition of catecholborane
P1 Phenethyl peptide boronic acid inhibitors of HCV NS3 protease
作者:E.Scott Priestley、Indawati De Lucca、Bahman Ghavimi、Susan Erickson-Viitanen、Carl P. Decicco
DOI:10.1016/s0960-894x(02)00682-0
日期:2002.11
A series of peptide boronic acids containing extended, hydrophobic P1 residues was prepared to probe the shallow, hydrophobic S1 region of HCV NS3 protease. The p-trifluoromethylphenethyl P1 substituent was identified as optimal with respect to inhibitor potency for NS3 and selectivity against elastase and chymotrypsin. (C) 2002 Published by Elsevier Science Ltd.