Dihydrophenanthridine: A New and Easily Regenerable NAD(P)H Model for Biomimetic Asymmetric Hydrogenation
摘要:
A new and easily regenerable NAD(P)H model 9,10-dihydrophenanthridine (DHPD) has been designed for biomimetic asymmetric hydrogenation of imines and aromatic compounds. This reaction features the use of hydrogen gas as terminal reductant for the regeneration of the DHPD under the mild condition. Therefore, the substrate scope is not limited in benzoxazinones; the biomimetic asymmetric hydrogenation of benzoxazines, quinoxafines, and quinolines also gives excellent activities and enantioselectivities. Meanwhile, an unexpected reversal of enantioselectivity was observed between the reactions promoted by the different NAD(P)H models, which is ascribed to the different hydride transfer pathway.
One-Pot Construction of Indolo[2,3-<i>b</i>]quinoxalines through Ruthenium-Catalyzed <i>Ortho</i> C–H Bond Functionalization of 2-Arylquinoxalines with Sulfonyl Azides
N-substituted indolo[2,3-b]quinoxalines has been developed through a Ru(II)-catalyzed ortho C–H functionalization of 2-arylquinoxalines with sulfonyl azides and further oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone in one pot. This double C–N bond formation strategy provides a new efficient route for the preparation of a series of biologically relevant 6H-indolo[2,3-b]quinoxaline derivatives in
N-取代的吲哚并[2,3- b ]喹喔啉的合成是通过Ru(II)催化的2-芳基喹喔啉与磺酰叠氮化物的邻位C-H官能化并用2,3-二氯-5进一步氧化而开发的, 6-二氰基-1,4-苯醌一锅。这种双C-N键形成策略为制备一系列生物相关的6 H-吲哚[2,3- b ]喹喔啉衍生物提供了一条新的有效途径,产率高达94%,表明底物适用范围广泛。初步的机理研究表明,连续的 C-N 键形成是通过第一步中五元钌环中间体的形成和第二步中自由基机制的形成进行的。
One-step approach for the synthesis of functionalized quinoxalines mediated by T3P®–DMSO or T3P® via a tandem oxidation–condensation or condensation reaction
作者:Kachigere B. Harsha、Kanchugarkoppal S. Rangappa
DOI:10.1039/c6ra03078e
日期:——
An easy and efficient propylphosphonic anhydride (T3P®)–DMSO or T3P® mediated oxidation–condensation or condensationreaction for the synthesis of quinoxalines derived from the interaction of different arrays of condensing partners with ortho-phenylene diamines (o-PDs) under simple and mild reaction conditions in one step has been reported for the first time.
[EN] INHIBITORS OF HIF PROLYL HYDROXYLASE<br/>[FR] INHIBITEURS DE LA HIF PROLYL-HYDROXYLASE
申请人:MERCK SHARP & DOHME
公开号:WO2016049099A1
公开(公告)日:2016-03-31
The present invention concerns compounds of formula I or pharmaceutically acceptable salts thereof, which inhibit HIF prolyl hydroxylase, their use for enhancing endogenous production of erythropoietin, and for treating conditions associated with reduced endogenous production of erythropoietin such as anemia and like conditions, as well as pharmaceutical compositions comprising such a compound and a pharmaceutical carrier.
Electrochemical Arylation of Electron‐Deficient Arenes through Reductive Activation
作者:Pan Wang、Zhenlin Yang、Ziwei Wang、Chenyang Xu、Lei Huang、Shengchun Wang、Heng Zhang、Aiwen Lei
DOI:10.1002/anie.201909600
日期:2019.10.28
An electrochemical method has been developed to achieve arylation of electron-deficientarenes through reductive activation. Various electron-deficientarenes and aryldiazonium tetrafluoroborates are amenable to this transformation within the conditions of an undivided cell, providing the desired products in up to 92 % yield. Instead of preparing diazonium reagents, these reactions can begin from anilines
A transition metal-free synthesis of 2-arylquinoxaline is achieved by using arylhydrazine salt as an aryl radical arylation reagent and air as an oxidant in the presence of K2CO3. This protocol features metal-free, no additives, mild reaction conditions, environment friendly, and can be used to construct biologically active molecules containing 2-phenylquinoxaline structure.
在 K 2 CO 3存在下,使用芳基肼盐作为芳基自由基芳基化试剂,空气作为氧化剂,实现了 2-芳基喹喔啉的无过渡金属合成。该方案不含金属、无添加剂、反应条件温和、环境友好,可用于构建含有2-苯基喹喔啉结构的生物活性分子。