line 7. From biological evaluations, 15b and 15d emerged as potent inhibitors of HCV replication on a replicon assay. These findings demonstrate that synthesized pyrrolidine nucleosides represent a new template for antiviral or other biological studies and could be considered for novel combination therapy against HCV infection using nucleoside inhibitors and non-nucleoside inhibitors of HCV NS5B.
4-Substituted-α,α-diaryl-prolinols Improve the Enantioselective Catalytic Epoxidation of α,β-Enones
作者:Yawen Li、Xinyuan Liu、Yingquan Yang、Gang Zhao
DOI:10.1021/jo0617619
日期:2007.1.1
To seek novel metal-free organic catalysts for epoxidation with high stereoselectivity, a series of 4-substituted-α,α-diaryl-prolinols were synthesized in four steps from trans-4-hydroxyl-l-proline. These prolinol derivatives catalyzed the asymmetric epoxidation of α,β-enones to give the corresponding chiral epoxides in good yields and high enantioselectivities under mild reaction conditions. Studies
NOVEL NI COMPLEX AND ITS DERIVATIVES, PRODUCING METHOD, AND THE USE THEREOF AS AN ANTIOXIDANT
申请人:Lee Way-Zen
公开号:US20130317224A1
公开(公告)日:2013-11-28
The present invention relates to a novel nickel complex and its derivatives, which mimic the active site of Ni-containing superoxide dismutase (NiSOD). The five-coordinate Ni(II) and Ni(III) complexes or their derivatives, and six-coordinate derivatives have the following structures of formula (I) and (II):
The nickel complexes and their derivatives of the invention act as anti-oxidants or free radical scavengers. The invented nickel complexes can be used in the preparation of medicines, health foods or cosmetics for human, animals and plants, or can be used in environmental or soil protection.
H-Bond-Directing Organocatalyst for Enantioselective [4 + 2] Cycloadditions via Dienamine Catalysis
作者:Shoulei Wang、Carles Rodriguez-Escrich、Miquel A. Pericàs
DOI:10.1021/acs.orglett.5b03575
日期:2016.2.5
regio- and stereoselective [4 + 2] cycloaddition reaction to generate tetrahydropyranopyrazole frameworks has been developed. To this end, a dienamine-based catalytic strategy that relies on the H-bond-directing effect of the hydroxy group of a dinaphthylprolinol-type aminocatalyst has been used. This enables the synthesis of multifunctionalized heterocyclic derivatives with threecontiguous stereocenters
Novel, chiral Lewisbase organocatalysts, which displayed poor enantioselection in the hydrosilylation of N-aryl β-enamino esters, were found to be the catalysts of choice in the hydrosilylation of α-imino esters. In the presence of 10 mol-% of the best catalyst, various α-imino esters underwent enantioselectivehydrosilylation to provide a wide range of chiral α-amino esters with good yields (up to