ABSTRACT
A protocol for the anti-Markovnikov hydrofunctionalization of alkenes has been developed by the use of a benzyl group as a traceless redox-active hydrogen donor. Under copper catalysis and in the presence of CF3 - or N3 -containing hypervalent iodine reagents, a series of homoallylic alcohol derivatives were hydrofunctionalized regioselectivity. A similar principle was also applied to the hydrofunctionalization of alkenols.
ABSTRACT
Denitrogenative 6-endo-dig azide-yne cyclization of α-propargyloxy-ß-haloalkylazides was enabled by gold catalysis, thus providing 2H-1,3-oxazines. This rare cyclization mode in gold-catalyzed reactions of azide-yne substrates was demonstrated to be facilitated and controlled by electronic and resonance effects of the alkyne substituents. Molecular transformations of the as-prepared 2H-1,3-oxazines were also investigated.
ABSTRACT
Radical perfluoroalkylation of α-(biaryl-2-yl)vinyl azides is capable of supplying polyfluoroalkyl aza-polycyclic aromatic hydrocarbons (aza-PAHs). Commercially available Me3SiRf (Rf = CF3, C2F5, and C3F7) are employed as the sources of perfluoroalkyl radicals upon oxidation with PhI(OAc)2. The addition of perfluoroalkyl radicals to biarylvinyl azides generates the corresponding iminyl radicals, which subsequently cyclize with the intramolecular arene moiety, furnishing aza-PAH skeletons having polyfluoroalkyl (RfCH2) function.
Subject(s)
Aza Compounds/chemical synthesis , Azides/chemistry , Polycyclic Aromatic Hydrocarbons/chemical synthesis , Aza Compounds/chemistry , Catalysis , Cyclization , Molecular Structure , Oxidation-Reduction , Polycyclic Aromatic Hydrocarbons/chemistryABSTRACT
A method for the synthesis of amide-containing molecules was developed using vinyl azides as an enamine-type nucleophile towards carbon electrophiles, such as imines, aldehydes, and carbocations that were generated from alcohols in the presence of BF3 â OEt2 . After nucleophilic attack of the vinyl azide, a substituent of the resulting iminodiazonium ion intermediate migrates to form a nitrilium ion, which is hydrolyzed to afford the corresponding amide.
Subject(s)
Amides/chemical synthesis , Azides/chemistry , Azo Compounds/chemistry , Nitriles/chemistry , Vinyl Compounds/chemistry , Molecular StructureABSTRACT
The fluorine-containing organic motif is becoming privileged in pharmaceuticals, agrochemicals, and functional materials, owing to its unique properties such as electron-withdrawing character, metabolic stability, and lipophilicity. Described herein is the PhI(OAc)2 -mediated radical trifluoromethylation of vinyl azides with Me3 SiCF3 to efficiently generate α-trifluoromethyl azines. The resulting α-trifluoromethyl azines were successfully transformed to valuable fluorine-containing molecules such as α-trifluoromethyl ketones, ß-trifluoromethyl amines, 5-fluoropyrazoles, and trifluoroethyl isoquinolines.
