The “Corey's Reagent,” 3,5-di-tert-butyl-1,2-Benzoquinone, as a Modifying Agent in the Synthesis of Fluorescent and Double-Headed Nucleosides
摘要:
A new method for the synthesis of fluorescent nucleosides has been developed. It has been shown that a reaction of benzoquinone with aminopropenyl group at C-5-position of 2'-deoxyuridine or 2'-deoxycytidine and aminopropynyl group at the C-7-position of 8-aza-7-deazaadenosine under extremely mild conditions affords conjugated benzoxazole derivatives of nucleosides, which possess strong fluorescent properties. In a similar reaction 5'-amino-5'-deoxy-nucleosides form double-headed nucleoside derivatives with benzoxazole attached at C-4'-position.
The “Corey's Reagent,” 3,5-di-tert-butyl-1,2-Benzoquinone, as a Modifying Agent in the Synthesis of Fluorescent and Double-Headed Nucleosides
摘要:
A new method for the synthesis of fluorescent nucleosides has been developed. It has been shown that a reaction of benzoquinone with aminopropenyl group at C-5-position of 2'-deoxyuridine or 2'-deoxycytidine and aminopropynyl group at the C-7-position of 8-aza-7-deazaadenosine under extremely mild conditions affords conjugated benzoxazole derivatives of nucleosides, which possess strong fluorescent properties. In a similar reaction 5'-amino-5'-deoxy-nucleosides form double-headed nucleoside derivatives with benzoxazole attached at C-4'-position.
METHOD FOR PRODUCING AN ARENE WITH AN AROMATIC C-N BOND ORTHO TO AN AROMATIC C-O BOND
申请人:THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/MCGILL UNIVERSITY
公开号:US20170066711A1
公开(公告)日:2017-03-09
A method for producing an arene with an aromatic C—N bond ortho to an aromatic C—O bond from a hydroxy arene comprising said aromatic C—O bond is provided. This method comprising the steps a) ortho-oxygenating the hydroxy arene to produce an ortho-quinone, b) condensating the ortho-quinone with a nitrogen nucleophile to generate a compound of Formula (IVa) or (IVb), and c) allowing 1,5-hydrogen atom shift of the compound of Formula (IVa) or (IVb), thereby producing arenes with a C—N bond ortho to a C—O bond of Formula (Va) and (Vb), respectively:
sensitive groups (hydroxyl, cyano, amino, vinyl, ethynyl, ester, and even acetyl groups) and heterocycles, which affords functionalized benzoxazoles in good to excellent yields by employing low catalyst loading (2 mol % Cu). The characterization and plausible catalytic mechanism of Cu(OH)x/OMS-2 are described. The notable features of our catalytic protocol such as the use of air as the benign oxidant
Divers benzoxazole heterocyclic products have been synthesized by a facile, efficient, and eco‐friendly strategy. The synthesis of benzoxazoles was catalyzed by nanostructured iron(III)‐porphyrin complex at room temperature under green conditions.
was applied for the synthesis of benzoxazoles via a C(aryl)−OH functionalization of catechol derivatives and amines in ethanol at room temperature. In the next step, aminoacids have been applied as nontoxic and cheap alternatives for amines. The obtained products were similar with the regular amines case. This is the first report about the application of aminoacids as alternatives for primary amines