Anionic Homologous Fries Rearrangement of O-(2-Methylaryl)carbamates. A Regiospecific Route to Benzo[b]furan-2(3H)-ones including an Unnamed Metabolite from Helenium Species
摘要:
一种新的 LDA 介导的 O → C 氨基甲酰基迁移 3 为芳基乙酰胺 5(苯并呋喃酮和萘并呋喃酮 7 的前体)提供了一条普遍而有效的途径,其中一种芳基乙酰胺 5 可作为简短合成从几种 Helenium 植物中分离出来的天然苯并呋喃内酯 11 的起始原料。
Synthesis of Unsymmetrical Diaryl Acetamides, Benzofurans, Benzophenones, and Xanthenes by Transition-Metal-Free Oxidative Cross-Coupling of <i>sp</i><sup>3</sup> and <i>sp</i><sup>2</sup> C–H Bonds
A chemo- and regioselective intermolecular sp3 C–H and sp2 C–H coupling reaction for C–C bond formation is described to access unsymmetrical diaryl acetamides under TM-free conditions from sec- and tert-arylacetamides and nitroarenes using tert-butoxide base in DMSO at room temperature. The coupling partners with sensitive functionalities such as chloro, bromo, hydroxy, and cyano were also amenable
N‐diethylarylamide using CIPE‐assisted α‐silyl carbanions (CIPE=complex‐inducedproximityeffect) has been developed using a simple reagent combination of LDA (lithium diisopropylamide) and chlorosilane. A study of the mechanism, and the application of the procedure to an anionic Snieckus–Fries rearrangement for a highly efficient synthesis of the potent phosphatidylinositol 3‐kinase (PI3K) inhibitor LY294002
Developing the Scope of O→C Aryl Migrations: Exploring Amide Substrates as Potential Precursors for Asymmetric Reactions
作者:Dana Ameen、Timothy J. Snape
DOI:10.1002/ejoc.201301716
日期:2014.3
production of diasteromerically enriched α-aryl carbonyl compounds has been achieved. Although only modest diastereoselectivies are observed, they demonstrate the potential of the method for further optimisation. It also appears that reactions that proceed through a five-membered spirocyclic transition state rearrange, whereas those proceeding through a six-membered transition state do not, but stop at
[EN] A METHOD OF MANUFACTURING (S)-5-METHOXY-2-[[(4-METHOXY-3,5-DIMETHYL-2- PYRIMIDINYL)METHYL]SULFINYL]-1H-BENZIMIDAZOLE USING A CHIRAL COMPLEX WITH MANDELIC ACID<br/>[FR] PROCÉDÉ DE FABRICATION DE (S)-5-MÉTHOXY-2-[[(4-MÉTHOXY-3,5-DIMÉTHYL-2-PYRIDINYL)MÉTHYL]SULFINYL]-1H-BENZIMIDAZOLE À L'AIDE D'UN COMPLEXE CHIRAL AVEC DE L'ACIDE MANDÉLIQUE
申请人:ZENTIVA KS
公开号:WO2011120475A1
公开(公告)日:2011-10-06
The invention deals with a new manufacturing method of (S)-5-methoxy-2-[[(4-methoxy- 3,5-dimethyl-2-pyridinyl)methyl]sulphinyl]-1H-benzimidazole of formula (I) and its salts of general formula (II), wherein the sulfide of general formula (III) is oxidized by hydroperoxides on a catalyst consisting of a chiral metallic complex containing ligands constituted by chiral functional derivatives of mandelic acid.
Directed <i>ortho</i>
-Metalation of <i>O</i>
-Aryl <i>N</i>
,<i>N</i>
-Dialkylcarbamates: Methodology, Anionic <i>ortho</i>
-Fries Rearrangement, and Lateral Metalation
作者:M. A. Jalil Miah、Mukund P. Sibi、S. Chattopadhyay、Oluwole B. Familoni、Victor Snieckus
DOI:10.1002/ejoc.201701142
日期:2018.1.31
to afford a range of polysubstituted aromatic compounds (Tables 1 and 2, Schemes 2 and 3). Warming solutions of the ortho-lithiated O-carbamates to room temperature without external quench with electrophiles leads to the formation of salicylamide and 1- and 2-hydroxynaphthamide derivatives by an anionic ortho-Fries rearrangements (Scheme 4). The relative stability and reactivity of different N,N-dialkyl