Type 8 isoquinoliniumzwitterions were synthesised by the reaction of type 1 diketones or type 2 pyrylium salts with different 5-amino-3-Q-1H-1,2,4-triazoles. Spectroscopic and X-ray diffraction evidence was given for the zwitterion structure of the products obtained. The position of the negative charge on the 1,2,4-tiazolium ring was proved by comparison of the cmr and uv spectra of the products
Unexpected formation of 1,2-dihydro-2-azolyl-and azinylisoquinolines by the reduction of the corresponding isoquinolinium salts with sodium borohydride in methanol
作者:Ibolya Prauda、Mária Tóth-Lauritz、József Reiter
DOI:10.1002/jhet.5570410611
日期:2004.11
The reduction of different 2-azolyl-and azinylisoquinolinium salts with sodiumborohydride in methanol was studied. Surprisingly, contrary to what is found in the literature 1,2-dihydroisoquinoline derivatives were obtained. Their formation was attributed to the electron withdrawing character of the heterocyclic ring in position 2 of the isoquinolinium moiety. This was corroborated by synthesis and
Synthesis of novel type pyrazolyl and tetrazolyl isoquinolinium zwitterions
作者:Ibolya Prauda、Jozsef Reiter
DOI:10.1002/jhet.5570380130
日期:2001.1
New type pyrazol-3-yl-isoquinolinium hydrochloride (8a) and tetrazol-5-yl-isoquinolinium (8b) zwitterions were synthesised. Their structures were proved by ir, pmr, cmr, ms spectra as well as X-ray diffraction analysis of model compounds.