A facile synthesis of naturally occurring binaphthoquinones: efficient oxidative dimerization of 4-alkoxy-1-naphthols using silver(II) oxide–40% nitric acid
Oxidation of 4-alkoxy-1-naphthols with AgO–40% HNO3 occurred along with a dimerization to give the corresponding bi-1,4-naphthoquinones. The oxidative dimerization required one hydroxyl group and took place at its ortho position. This reaction was applicable to syntheses of naturallyoccurring binaphthoquinones, bivitamin K3 and 3,3′-bijuglone.
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
Three types of dimeric naphthoquinones, which possess structurally diverse skeletons, can be prepared in one step from 2-bromo-3-methyl-1,4-naphthoquinones. 2,2'-Dimeric naphthoquinones were prepared by a one-pot Stille-type reaction via vinylstannanes. Oxepines are formed by unexpected domino reactions via 1,4-dihydroxynaphthalene species. Epoxides are formed by a Michael/Darzens reaction via the o-quinone methides.
Laatsch, Hartmut, Zeitschrift fur Naturforschung, B: Chemical Sciences, 1990, vol. 45, # 7, p. 1037 - 1042
作者:Laatsch, Hartmut
DOI:——
日期:——
LAATSCH, HARTMUT, Z. NATURFORSCH. B, 45,(1990) N, C. 1037-1042