1,721,183 research outputs found
Sintesi Stereoselettiva di Tetraidrofurani 1,2,3-Trisostituiti mediante contrazione di anello dei Glicali
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Synthesis, reactivity and selectivity of carba vinyl epoxides 5a and 5ß and corresponding vinyl aziridines 6a and 6ß as new useful carbasugars synthetic tools.
No full textSynthesis of Protected (1-Phenyl-1H-pyrrol-2-yl)-alkane-1-amines from Phenylnitroso Diels?Alder Adducts with 1,2-Dihydropyridines
No full textThe reductive cleavage of nitrosobenzene-derived cycloadducts with appropriately protected 1,2-dihydropyridines allows a novel and simple obtainment of substituted N-[1-(1-phenyl-1H-pyrrol-2-yl)alkylamides. This synthesis can also be carried out in a very simple, mild, and practical one-pot procedure without isolation of the corresponding nitrosobenzene cycloadduct by means of catalytic amounts of CuCl
Stereoselective synthesis of (±)-6-deoxy-4-amino-2,3-unsaturated-N-Cbz-imino-O-Glycosides via Diastereoisomeric N-Cbz-imino glycal-derived allyl N-nosyl aziridines
No full textSYNTHESIS, REACTIVITY AND SELECTIVITY STUDIES ON CARBAGLYCAL-DERIVED N-PROTECTED AZIRIDINES 3a AND 3ß_AS NEW USEFUL CARBASUGARS SYNTHETIC TOOLS
No full textSynthesis of New Piperidinyl Enamides and Enecarbamates by Unconventional Elaboration of NDA Cycloadducts
No full textSynthesis of 2,7-diazabicyclo[2.2.1]heptenes by N-O bond cleavage of arylnitroso diels-alder 1,2-dihydropyridine cycloadducts
No full textThe cleavage of the N-O bond of nitrosoarene-derived cycloadducts with 1,2-dihydropyridines gives different products depending on the protecting group of the starting dihydropyridine and reaction conditions. The use of catalytic amounts of CuCl in non-nucleophilic solvents in combination with a N-phenoxycarbonyl-protected nitrosophenyl-derived cycloadduct allowed the unprecedented formation of the 2,7-diazabicycle[2.2.1]heptene scaffold. It was also demonstrated that this novel bicyclic gem-diamine derivative is an isolable intermediate en route to pyrrole derivatives. On the other hand, the corresponding nitrosopyridine-derived cycloadduct showed to be unreactive with copper salts, but the application of different reductive conditions can deliver the corresponding bicyclic gem-diamine derivative or 3-aminotetrahydropyridine also in enantioenriched form. © Georg Thieme Verlag Stuttgart
STEREOSELECTIVE SYNTHESIS OF (±)-4-AMINO-4,6-DIDEOXY-2,3-UNSATURATED AZA-O-GLYCOSIDES VIA NEW DIASTEREOISOMERIC (±)-6-DEOXY-N-Cbz-IMINO GLYCAL-DERIVED ALLYL N-NOSYL AZIRIDINES
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