Transformations of mono- and bis(acyl)hydrazones: Synthesis of cyclic N,O,S-acetals/ketals.  Page description

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Details of project

 
Identifier
37201
Type K
Principal investigator Somogyi, László
Title in Hungarian Mono- és bisz(acil)hidrazonok átalakulásai: Gyűrűs N,O,S-acetálok/ketálok szintézise.
Title in English Transformations of mono- and bis(acyl)hydrazones: Synthesis of cyclic N,O,S-acetals/ketals.
Panel Chemistry 2
Department or equivalent Department of Organic Chemistry (University of Debrecen)
Starting date 2002-01-01
Closing date 2005-12-31
Funding (in million HUF) 2.288
FTE (full time equivalent) 0.00
state closed project





 

Final report

 
Results in Hungarian
Aldehid- és keton-tioszemikarbazonokat állítottunk elő, melyeket acilezési körülmények között 3-acil-1,3,4-tiadiazolinokká ciklizáltunk. A 2-monoszubsztituált heterogyűrűs vegyületek oxidáló, illetve dehidrogénező szerek [kálium permanganát és a most első ízben alkalmazott ágensek: ammónium cerium(IV)nitrát (CAN), 2,3-diklór-5,6-dicián-1,4-benzochinon, jodobenzol-diacetát] hatására tiadiazolokká alakultak. A 2,2-diszubsztituált 3-acil-1,3,4-tiadiazolinok CAN-nal jó hozammal a kiindulási ketonokká voltak lebonthatók. [HETEROCYCLES, 63 (2004) 2243-2267.] A tioflavanon hidrazinnal 3-(2-merkaptofenil)-5-fenil-pirazollá volt alakítható, amit diszulfidja formájában izoláltunk. Ezt acetilezéssel 2-(1-acetil-5-fenilpirazol-3-il)fenil-diszulfiddá alakítottuk. A termék MALDI-TOF tömegspektrometriás vizsgálata nem csak a molekulasúlyt igazolta, hanem a kationizáló Ag3+ és a molekula közti érdekes kölcsönhatás felismerését és tanulmányozását is lehetővé tette. [J. Am. Soc. Mass Spectrom. 15 (2004) 879-883.]
Results in English
Aldehyde and ketone thiosemicarbazones were synthesized and cyclized into 3-acyl-1,3,4-thiadiazolines under acylating conditions. Reactions of the 2-monosubstituted heterocycles with oxidizing and dehydrogenating agents (potassium permanganate, of for the first time with ceric ammonium nitrate, 2,3-dichloro-5,6-dicyano-1,4-benzoquinone, iodobenzene diacetate) lead to the formation of thiadiazoles. Ceric ammonium nitrate oxidation of 2,2-disubstituted 3-acyl-1,3,4-thiadiazolines regenerates the parent ketones efficiently. [HETEROCYCLES, 63 (2004) 2243-2267.] Reaction of thioflavanone with hydrazine lead to the formation of 3-(2-mercaptophenyl)-5-phenylpyrazole, isolated as the disulfide. Acetylation of the product afforded 2-(1-acetyl-5-phenylpirazol-3-yl)phenyl disulfide. The PSD MALDI MS/MS studies on this acetyl derivative cationized with the Ag3+ cluster ion showed that the fragmentation of the ion is predominantly governed by the interaction between the analyte and the cluster ion. It was also shown that a strong interaction of a molecule with a cluster ion may result in the alteration of the fragmentation channel of the silver cluster ion. [J. Am. Soc. Mass Spectrom. 15 (2004) 879-883.]
Full text http://real.mtak.hu/105/
Decision
Yes





 

List of publications

 
L. Somogyi: Transformation of Isatin 3-Acylhydrazones under Acetylating Conditions: Synthesis and Structure Elucidation of 1,5’-Disubstituted 3’-Acetylspiro[oxindole-3,2’-[1,3,4]oxadiazolines], Bull. Chem. Soc. Jpn., 74, 873-881, 2465, 2001
L. Somogyi: Synthesis, Oxidation and Dehydrogenation of Cyclic N,O- and N,S-Acetals. Part 1. Transformation of N,S-Acetals: 3-Acyl-1,3,4- thiadizolines, Heterocycles, 2004, 63, 2243-2267, 2004
S. Kéki, L. Nagy, Gy. Deák, M. Zsuga, L. Somogyi, A. Lévai: Cationization of Simple Organic Molecules by Singly-Charged Ag3+ Cluster Ions in Matrix-Assisted Laser Desorption/Ionization Mass Spectrometry: Metal Cluster – Molecule Interactions, J. Am. Soc. Mass Spectrom., 15, 879-883, 2004
L. Somogyi: Elimination, ring-contraction, and fragmentation reactions of 1-thioflavanone 1-oxides, Can. J. Chem., 79, 1159-1165, 2001




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