N-Quaternary Compounds. Part XLVIII. Photochemical Rearrangement of Pyridinium-3-olates to 2-Pyridones.
نویسندگان
چکیده
منابع مشابه
Photochemical dehydrogenation of 3,4-dihydro-2-pyridones.
Photochemical dehydrogenation of various substituted 3,4-dihydro-2-pyridones was achieved in a very efficient way by employing 10-15 mol% of photo-induced electron transfer sensitizers like 9-cyanoanthracene, 9-cyanophenanthrene and 1-cyanonaphthalene in presence of molecular oxygen, for the first time.
متن کاملLewis base mediated halogenation/semipinacol rearrangement of diazo compounds: new access to α-halo-quaternary ketones.
A novel halogenation/semipinacol rearrangement of α-diazo alcohol catalyzed by Lewis base has been developed through a carbene-free mechanism. This semipinacol transposition, initiated by an electrophilic halogenation (X = Cl(+), Br(+), and I(+)) of diazo carbon event, furnished a convenient synthetic route for the efficient synthesis of α-halo-quaternary ketones under mild conditions.
متن کاملPreparation of 2- and 6-pyridones of N’-methylnicotinamide”
In the course of experiments designed to elucidate the structure of reduced diphosphopyridine nucleotide (DPNH) (12), it became necessary to prepare the 2and 6-pyridones of iV-methylnicotinamidel by oxidation of the latter. Huff (5) has described the preparation of N’-methyl-6-pyridone-3-carboxylic acid by alkaline ferricyanide oxidation of either trigonelline or N’-methylnicotinamide. The acid...
متن کاملPyridinium N-2 0-pyridylaminide: synthesis of 3-aryl-2-aminopyridines through an intramolecular radical process
Tris(trimethylsilyl)silane (TTMSS) and azobisisobutironitrile (AIBN) promote the intramolecular heteroarylation of arenesulfonamides with pyridyl radicals under thermal conditions. The arenesulfonamides are easily prepared from pyridinium N-2 0pyridylaminide. The heteroarylation process involves pyridyl radical cyclization and ipso substitution. q 2004 Elsevier Ltd. All rights reserved.
متن کامل4-(N-Propan-2-ylcarbamoyl)pyridinium perchlorate
In the title compound, C(9)H(13)N(2)O(+)·ClO(4) (-), the dihedral angle between the planes of the amide group and the pyridinium fragment is 34.11 (14)°. In the crystal, the cations are connected by N-H⋯O hydrogen bonds between the amide groups into chains extended along the a axis. Hydrogen bonds between the pyridinium N-H group and the perchlorate anions organize the chains into a two-dimensi...
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ژورنال
عنوان ژورنال: Acta Chemica Scandinavica
سال: 1978
ISSN: 0904-213X
DOI: 10.3891/acta.chem.scand.32b-0068