Dimere Naphthochinone, VI Synthese von 3,3′-Biplumbagin und verwandten 3,3′-Dimethyl-2,2′-bi-1,4-naphthochinonen durchC-Methylierung mit Diazomethan
作者:Hartmut Laatsch
DOI:10.1002/jlac.198319830215
日期:1983.2.15
3,3′-Dimethyl-2,2′-bi-1,4-naphthochinonen vom Typ 6/7 sind auf dem Wege der Phenol/Chinon-Addition oder durch Phenol-Oxidation von 3-Methyl-1-naphtholen nicht oder nur mit unbefriedigenden Ausbeuten zugänglich. Entsprechende Dimere, von denen einige in der Natur vorkommen, entstehen jedoch leicht durch Addition von Diazomethan an 3,3′-unsubstituierte 2,2′-Binaphthochinone 4/5 und Thermolyse der primär
THE ADDITION OF DIAZOMETHANE AND SOME OF ITS DERIVATIVES TO ALPHA-NAPHTHOQUINONE
作者:Louis F. Fieser、Mary A. Peters
DOI:10.1021/ja01362a024
日期:1931.11
Zur Synthese und Struktur derp-Indazolchinone und ihrer Methylierungsprodukte Untersuchungen �ber Chinone, 8. Mitt.
作者:Robert Ott、Erfried Pinter
DOI:10.1007/bf00812321
日期:——
The p-benzoquinones 5 e-j react with diazomethane (after dehydrogenation) to 6-anilino- 2e, dimethylamino- 2h, phenylthio- 2i, and methylthioindazolquinone 2 j. Methylation with dimethylsulfate of these as well as of the already known indazolquinones 6-toluidino- 2 f, 6-methylanilino- 2 g, 5-tert.butyl- 2 m, 5,6-methyl- (isomer mixture) 2 l, n, and benz-indazolquinone 2 o yield the 1- and 2-N-methyl derivatives 3 and 4. The structure of the 2-methyl derivatives is established by reaction of the corresponding benzoquinones with 3-methylsydnon in the case of 4 e, 4 g. UV/VIS-, IR- and H-1-NMR-spectroscopy (in CDCl3 and DMSO) were used for structure determination. Comparison of the UV/VIS-spectra of 2 - 4 shows that the indazolquinones are existing as 2 H-4,7-diones. For the structure elucidation of the 1- rs. 2-methylderivatives (which 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.
Laatsch, Hartmut, Liebigs Annalen der Chemie, 1984, # 7, p. 1367 - 1381
作者:Laatsch, Hartmut
DOI:——
日期:——
Laatsch, Hartmut, Liebigs Annalen der Chemie, 1980, # 1, p. 140 - 157