Catalytic dehydrogenative dual functionalization of ethers: dealkylation–oxidation–bromination accompanied by C–O bond cleavage via aerobic oxidation of bromide
A catalytic dehydrogenative dual functionalization (DDF) of ethers viaoxidation, dealkylation, and α-bromination by the aerobic oxidation of bromide was developed to obtain the corresponding α-bromo ketones in high yields. In particular, the reaction of substituted tetrahydrofurans as cyclic ethers provided 3,3-dibromo tetrahydrofuran-2-ols in high yields selectively through the double α-bromination
Site- and Enantiodifferentiating C(sp<sup>3</sup>)–H Oxidation Enables Asymmetric Access to Structurally and Stereochemically Diverse Saturated Cyclic Ethers
作者:Shutao Sun、Yiying Yang、Ran Zhao、Dongju Zhang、Lei Liu
DOI:10.1021/jacs.0c09636
日期:2020.11.11
A manganese-catalyzed site- and enantiodifferentiating oxidation of C(sp3)-H bonds in saturated cyclic ethers has been described. The mild and practical method is applicable to a range of tetrahydrofurans, tetrahydropyrans, and medium-sized cyclic ethers with multiple stereocenters and diverse substituent patterns in high efficiency with extremely efficient site- and enantiodiscrimination. Late-stage
<i>sp</i><sup>3</sup> C–H Arylation and Alkylation Enabled by the Synergy of Triplet Excited Ketones and Nickel Catalysts
作者:Yangyang Shen、Yiting Gu、Ruben Martin
DOI:10.1021/jacs.8b07405
日期:2018.9.26
polypyridyl complexes. Additionally, such a platform provides a new strategy for streamlining the synthesis of complex molecules with high levels of predictable site-selectivity and preparative utility. Mechanistic experiments suggest that sp3 C-H abstraction occurs via HAT from the ketone triplet excited state. We believe this study will contribute to a more systematic utilization of triplet excited ketones
[EN] LIGANDS OF MELANOCORTIN RECEPTORS AND COMPOSITIONS AND METHODS RELATED THERETO<br/>[FR] LIGANDS DU RECEPTEUR DE LA MELANOCORTINE ET COMPOSITIONS ET METHODES ASSOCIEES
申请人:NEUROCRINE BIOSCIENCES INC
公开号:WO2005040109A1
公开(公告)日:2005-05-06
Compounds which function as melanocortin receptor ligands and having utility in the treatment of melanocortin receptor-based disorders. The compounds have the following structure (I): (R4)s (R 2)n N~ X1-X2 (CR1aCRlb)q 1~ N R1-lm 1 O R3 (I) including stereoisomers, prodrugs, and pharmaceutically acceptable salts thereof, wherein m, n, q, s, R1, R1a, R1b, R2, R3, R4, X1 X2 and X3 are as defined herein. Pharmaceutical compositions containing a compound of structure (I), as well as methods relating to the use thereof, are also disclosed.
化合物作为黑色素皮质激素受体配体,并在治疗基于黑色素皮质激素受体的疾病中具有用途。这些化合物具有以下结构(I):(R4)s(R 2)n N〜X1-X2(CR1aCRlb)q 1〜N R1-lm 1 O R3(I),包括立体异构体,前药和其药用盐,其中m、n、q、s、R1、R1a、R1b、R2、R3、R4、X1、X2和X3如本文所定义。还公开了含有结构(I)化合物的药物组合物,以及与其使用相关的方法。
New method for C–H arylation/alkylation at α-position of cyclic aliphatic ethers by iron-oxide mediated reaction
作者:Parvinder Pal Singh、Satish Gudup、Hariprasad Aruri、Umed Singh、Srinivas Ambala、Mahipal Yadav、Sanghapal D. Sawant、Ram A. Vishwakarma
DOI:10.1039/c1ob06660a
日期:——
We report a new and efficient iron oxide catalyzed cross-coupling reaction between organometallic species such as alkyl/arylmagnesium halides or organolithium species and α-hydrogen bearing cyclic unbranched and branched aliphatic ethers via activation of C(sp3)–H. In the presence of 1 mol% of iron oxide, five and six membered unbranched cyclic ethers such as tetrahydrofuran and tetrahydropyran gave