caa a22 4500 469038217 CHVBK 20180323132801.0 cr unu---uuuuu 170328e19920801xx s 000 0 ger 10.1007/BF00812321 doi (NATIONALLICENCE)springer-10.1007/BF00812321 Zur Synthese und Struktur der p -Indazolchinone und ihrer Methylierungsprodukte Untersuchungen über Chinone, 8. Mitt [Elektronische Daten] [Robert Ott, Erfried Pinter] Synthesis and structure of p -indazolquinones and their methylation products. Studies on quinones, VIII Summary: Thep-benzoquinones5e-j react with diazomethane (after dehydrogenation) to 6-anilino-2e, dimethylamino-2h, phenylthio-2i, and methylthioindazolquinone2j. Methylation with dimethylsulfate of these as well as of the already known indazolquinones 6-toluidino-2f, 6-methylanilino-2g, 5-tert.butyl-2m, 5,6-methyl- (isomer mixture)2l,n, and benz-indazolquinone2o yield the 1-and 2-N-methyl derivatives3 and4. The structure of the 2-methyl derivatives is established by reaction of the corresponding benzoquinones with 3-methylsydnon in the case of4e,4g. UV/VIS-, IR- and1H-NMR-spectroscopy (in CDCl3 andDMSO) were used for structure determination. Comparison of the UV/VIS-spectra of2-4 shows that the indazolquinones are existing as 2 H-4,7-diones. For the structure elucidation of the 1- rs. 2-methylderivatives (whichh can be attributed to the methylation products) NMR-spectroscopy is well suited even without knowing the second isomer (solvent-effect). The course of the reaction of quinones with diazomethane and of the methylation reactions of the indazolquinones is discussed. Springer-Verlag, 1992 p -Indazolquinones nationallicence Ott Robert Institut für Pharmazeutische Chemie, Karl-Franzens-Universität Graz, A-8010, Graz, Österreich aut Pinter Erfried Institut für Pharmazeutische Chemie, Karl-Franzens-Universität Graz, A-8010, Graz, Österreich aut Monatshefte für Chemie / Chemical Monthly Springer-Verlag 123/8-9(1992-08-01), 713-729 0026-9247 123:8-9<713 1992 123 706 https://doi.org/10.1007/BF00812321 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00812321 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ott Robert Institut für Pharmazeutische Chemie, Karl-Franzens-Universität Graz, A-8010, Graz, Österreich aut NATIONALLICENCE 700 1- Pinter Erfried Institut für Pharmazeutische Chemie, Karl-Franzens-Universität Graz, A-8010, Graz, Österreich aut NATIONALLICENCE 773 0- Monatshefte für Chemie / Chemical Monthly Springer-Verlag 123/8-9(1992-08-01), 713-729 0026-9247 123:8-9<713 1992 123 706 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer