Syntheses with isoxazoles. Part II. Rearrangement of isoxazolo[2,3-a]-pyridinium salts into 5,6-dihydro-4H-furo[3,2-b]pyridin-2-ones
作者:R. H. Good、Gurnos Jones、J. R. Phipps
DOI:10.1039/p19720002441
日期:——
the tetrahydro-4-oxoisoxazolo [2,3-a]pyridinium salts (1) and (12) with boiling acetic anhydride gave the 5,6-dihydro-4H-furo[3,2-b]pyridin-2-ones (4) and (13). The structure of compound (4) has been proved by complete hydrogenation to piperidin-2-ylacetic acid, and by X-ray diffraction. The 2-methylisoxazolo-[2,3-a]pyridinium salt (11) did not undergo the rearrangement; this suggests a keten intermediate
用沸腾的乙酸酐对四氢-4-氧代恶唑啉[2,3- a ]吡啶鎓盐(1)和(12)进行简短处理,得到5,6-二氢-4 H-呋喃[3,2-b]吡啶- 2个(4)和(13)。化合物(4)的结构已通过完全氢化成哌啶-2-基乙酸并通过X射线衍射证明。2-甲基异恶唑啉代-[2,3-a]吡啶鎓盐(11)没有进行重排;这表明是通过除去2位上的氢原子形成的酮基中间体。5-溴衍生物(22)没有产生呋喃吡啶。发生吡啶或异恶唑环的断裂。
Chemodivergent Synthesis of Oxazoles and Oxime Ethers Initiated by Selective C–N/C–O Formation of Oximes and Diazo Esters
作者:Zhenjie Qi、Shaozhong Wang
DOI:10.1021/acs.orglett.1c03252
日期:2021.11.5
Chemodivergent reactions of oximes and diazo esters involving Rh-catalyzed [3+2] annulation and photodriven O–H insertion have been developed to generate oxazoles and oxime ethers. A range of aldehyde and ketone oximes reacted with α-diazocarbonyl compounds in a controllable manner in which functional groups, including ketone, ester, amide, ether, thiol ether, silane, alkene, allene, and alkyne groups
Ethyl glyoxylate O-tert-butyldimethylsilyloxime, on treatment with various alkenes in the presence of BF3·OEt2, generated a C-ethoxycarbonyl N-boranonitrone intermediate, which underwent intermolecular cycloaddition to afford 3-(ethoxycarbonyl)isoxazolidines in moderate to high yields.
Conventional methods generate nitrile oxides from oxime halides in organic solvents under basic conditions. However, the present work revealed that water‐assisted generation of nitrile oxides proceeds under mild acidic conditions (pH 4–5). Cycloadditions of nitrile oxides with alkynes and alkenes easily occurred in water without using catalysts, thus yielding isoxazoles and isoxazolines, respectively
[EN] HISTONE DEACETYLASE INHIBITORS<br/>[FR] INHIBITEURS DE L'HISTONE DÉSACÉTYLASE
申请人:ORCHID RES LAB LTD
公开号:WO2012117421A1
公开(公告)日:2012-09-07
Provided herein are isoform selective histone deacetylase inhibitors of the formula (I), their derivatives, analogs, tautomeric forms, stereoisomers, polymorphs, hydrates, metabolites, prodrugs, solvates, pharmaceutically acceptable salts and compositions thereof. These compounds are isoform selective inhibitors of HDACs and are useful as a therapeutic or ameliorating agent for diseases that are involved in cellular growth such as cancer, malignant tumors, autoimmune diseases, skin diseases, fungal infections, protozoal infections, HIV, inflammation and CNS disorders.