Abstract:rn Durch Kondensation von N3-Phenyl-benzamidrazon mit N-Dichlormethylen-benzamid, Phenylsenfol, Diphenylketen, N-[p-Tolyll-diphenylketenimin, Dicyclohexylcarbodiimid, einem Inamin, einem Acetylenather, S-Methyl-isothioharnstotf-sulfat, Oxalsaure-und Brenztraubensaureestern entstehen die entsprechenden s-Triazol-Derivate. Nj-Phenyl-N I-benzoylbenzamidrazon reagiert mit Thionylchlorid zum 1.2.3.5-Thiatriazol-S-oxid-Derivat (14).
Cyclocondensations of Open Chain AmidrazonesThe condensation of N3-phenylbenzamidraz… Show more
“…The 1 H nmr spectrum of 6a exhibited the presence of two typical trans olefinic protons at 8.13 and 5.03 ppm with a coupling constant J of 14 Hz. This conformation could explain the relative stability of 5a-b,6a towards an ulterior intramolecular cyclization involving the second nucleophilic nitrogen atom [14]. A comparable behavior of related amidines towards other biselectrophiles was previously described [15][16][17].…”
An easy Route to 2-Substituted-2,3-dihydro-5(7)H-oxazolo [3,2-a]pyrimidin-5-ones and 7-ones Starting from the Corresponding 2-Amino-2-oxazolines I. Forfar [a], J. Guillon [a], S. Massip [a], J.-M. Léger [a], J.-P. Fayet [b] and C. Jarry [a] [a] EA 2962 -The isomeric 2-substituted-7(5)-methyl-2,3-dihydro-5(7)H-oxazolo[3,2-a]pyrimidin-5-ones 3a-b and 7-ones 2a-b,7a were synthesized by cyclocondensation from the 5-substituted-2-amino-2-oxazolines 1a-b with biselectrophiles. In boiling ethanol, the reaction of 1a-b with acetylenic esters led to a mixture of 2a-b,7a with a small amount of (E)-2-N-(2-ethoxycarbonylethylene)-5-substituted-2-iminooxazolines 5a-b. The ring annulation between 1a-b and diketene gave the 2-substituted-7-hydroxy-7-methyl-2,3,6,7tetrahydro-5H-oxazolo[3,2-a]pyrimidin-5-ones 4a-b which can be easily dehydrated to provide the 2-substituted-7-methyl-2,3-dihydro-5H-oxazolo[3,2-a]pyrimidin-5-ones 3a-b.
“…The 1 H nmr spectrum of 6a exhibited the presence of two typical trans olefinic protons at 8.13 and 5.03 ppm with a coupling constant J of 14 Hz. This conformation could explain the relative stability of 5a-b,6a towards an ulterior intramolecular cyclization involving the second nucleophilic nitrogen atom [14]. A comparable behavior of related amidines towards other biselectrophiles was previously described [15][16][17].…”
An easy Route to 2-Substituted-2,3-dihydro-5(7)H-oxazolo [3,2-a]pyrimidin-5-ones and 7-ones Starting from the Corresponding 2-Amino-2-oxazolines I. Forfar [a], J. Guillon [a], S. Massip [a], J.-M. Léger [a], J.-P. Fayet [b] and C. Jarry [a] [a] EA 2962 -The isomeric 2-substituted-7(5)-methyl-2,3-dihydro-5(7)H-oxazolo[3,2-a]pyrimidin-5-ones 3a-b and 7-ones 2a-b,7a were synthesized by cyclocondensation from the 5-substituted-2-amino-2-oxazolines 1a-b with biselectrophiles. In boiling ethanol, the reaction of 1a-b with acetylenic esters led to a mixture of 2a-b,7a with a small amount of (E)-2-N-(2-ethoxycarbonylethylene)-5-substituted-2-iminooxazolines 5a-b. The ring annulation between 1a-b and diketene gave the 2-substituted-7-hydroxy-7-methyl-2,3,6,7tetrahydro-5H-oxazolo[3,2-a]pyrimidin-5-ones 4a-b which can be easily dehydrated to provide the 2-substituted-7-methyl-2,3-dihydro-5H-oxazolo[3,2-a]pyrimidin-5-ones 3a-b.
“…Thionylchlorid zu Oxadiazol-und TriazolSystemen reagieren. Mit Phosgen entstehen dabei vorzugsweise 1,3,4-Oxadiazolone und keine 1,2,4-Triazolone [13,14], Im Gegensatz dazu ist bei der Um setzung mit Thionylchlorid im allgemeinen die Bildung von Thiatriazol-S-oxiden gegenüber der von Oxathiadiazol-S-oxiden bevorzugt [11,14,15].…”
Section: Oxadiazin (10)unclassified
“…C 62,53 H 10,02 N 19,88,Gef. C 62,38 H 9,81 N 19,2, -I3C-NM R (CDCI3): (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)35,13,92 (2 CH ,);21,96,25,83,28,30,28,43,28,54,31,11 (6 C H ,) Ber . C 63,96 H 10,29 N 18,65,Gef.…”
Section: -Hoetmentioning
confidence: 99%
“…C 59,97 H 10,07 N 23,31,Gef. C 59,69 H 9,93 N 23,11. 4O (210,3) Aufgrund der thermischen Instabilität der Verbindung konnte eine korrekte Elem entar analyse erhalten werden.…”
Section: -Hoetunclassified
“…N'-Acyl-amidrazone liefern unter Eliminierung von W asser 1,2,4-Triazole [11,12]. Analog entsteht beim Erhitzen von 2'- 3,-yliden]benzohydrazid (9) in Phosphoroxichlorid unter Abspaltung von Wasser 3,2,[l, 3.4]…”
Ein eingehendes Studium der Umsetzung der von Bott eingeführten Vinyldiazoniumsalze [5] mit pri mären Aminen ergab, daß diese Reaktion eine neue, besonders einfache Variante zur Herstellung von 1-A lkyl-lH -l,2,3-triazolen darstellt, die eine nahezu freie Wahl der Aminkomponente erlaubt [6 , 7], Erwartungsgemäß isoliert man bei der Umsetzung von 2,2-Diethoxy-l-ethendiazonium-hexachloroantimonat ( la ) [8] mit primären Aminen 5 die korre spondierenden l-A lkyl-lH -l,2,3-triazole 7. Die bei dieser Reaktion freiwerdende HexachloroantimonBrought to you by | MIT Libraries
The syntheses and properties of two novel [Ru(bpy) 2 (L−LЈ)] n+ complexes with L−LЈ = 3-carboxy-5-(pyrid-2Ј-yl)-1,2,4-triazole (H 2 cpt) or 3-(ethoxycarbonyl)-5-(pyrid-2Ј-yl)-1,2,4-triazole (Hcept) ligands are described. Previous publications on Ru II complexes containing (pyrid-2Ј-yl)-1,2,4-triazoles revealed that their coordination is possible via N1 and N4 of the triazole ring. 1 H NMR spectroscopic data and the crystal structure of [Ru(bpy) 2 (cept)]PF 6 ·H 2 O (2) indicate that the coordination of the Hcpt − and cept − occurs via N1 of the triazole ring. The crystals of 2 are monoclinic and belong to the space group P2 1 /n with a = 12.339(7), b = 16.512 (7), c = 16.802(8) Å , β = 110.29(4)°, and Z = 4. A water molecule is hydrogen-bonded to the carbonyl oxygen atom of the
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.