报道了(R,R)-2,6-二甲基二氢-2 H-吡喃-4(3 H)-one的可扩展合成。该策略的关键是Ti(O i Pr)4催化的甲硅烷基保护的Kulinkovich环丙烷化(R)-3-羟基丁酸乙酯,随后环丙醇的氧化裂解。然后将所得的乙烯基酮中间体进行氧化Heck环化反应以形成共轭物添加所需的烯酮底物。实施了非对映选择性铜催化的格氏试剂加成步骤,以安装必需的甲基,其中包括1,3-双(二苯基膦基)丙烷和三甲基甲硅烷基氯,大大提高了该方法的耐用性。
PYRANONAPHTHOQUINONE COMPOUNDS AND METHODS OF USE THEREOF
申请人:University of Kentucky Research Foundation
公开号:US20180055816A1
公开(公告)日:2018-03-01
Provided herein are pyranonaphthoquinone compounds and methods of using pyranonaphthoquinone compounds. The method of using the pyranonaphthoquinone compounds includes selectively inhibiting 4E-BP1 phosphorylation by administering at least one pyranonaphthoquinone or pyranonaphthoquinone analog to a subject in need thereof. The pyranonaphthoquinone compounds includes a structure according to Formula I:
A short step synthesis of the bioactive piperidinealkaloid (-)-pinidinol was achieved using a cross metathesis and a reductive amination as the key steps.
A Divergent Enantioselective Strategy for the Synthesis of Griseusins
作者:Yinan Zhang、Qing Ye、Xiachang Wang、Qing-Bai She、Jon S. Thorson
DOI:10.1002/anie.201505022
日期:2015.9.14
enantioselective total synthesis of griseusin A, griseusin C, 4′‐deacetyl‐griseusin A, and two non‐native counterparts in 11–14 steps is reported. This strategy highlights a key hydroxy‐directed CH olefination of 1‐methylene isochroman with an α,β‐unsaturated ketone followed by subsequent stereoselective epoxidation and regioselective cyclization to afford the signature tetrahydro‐spiropyran ring. Colorectal
Total synthesis of griseusins and elucidation of the griseusin mechanism of action
作者:Yinan Zhang、Qing Ye、Larissa V. Ponomareva、Yanan Cao、Yang Liu、Zheng Cui、Steven G. Van Lanen、S. Randal Voss、Qing-Bai She、Jon S. Thorson
DOI:10.1039/c9sc02289a
日期:——
analogues is described. Key synthetic highlights include Cu-catalyzed enantioselective boration–hydroxylation and hydroxyl-directed C–H olefination to afford the central pharmacophore followed by epoxidation–cyclization and maturation via diastereoselective reduction and regioselective acetylation. Structural revision of griseusin D and absolute structuralassignment of 2a,8a-epoxy-epi-4′-deacetyl
Discovery of MK-6169, a Potent Pan-Genotype Hepatitis C Virus NS5A Inhibitor with Optimized Activity against Common Resistance-Associated Substitutions
We describe the discovery of MK-6169, a potent and pan-genotype hepatitis C virus NS5A inhibitor with optimized activity against common resistance-associated substitutions. SAR studies around the combination of changes to both the valine and aminal carbon region of elbasvir led to the discovery of a series of compounds with substantially improved potency against common resistance-associated substitutions in the major genotypes, as well as good pharmacokinetics in both rat and dog. Through further optimization of key leads from this effort, MK-6169 (21) was discovered as a preclinical candidate for further development.