A new synthesis of vitamin K viaπ-allyinickel intermediates
作者:Kikumasa Sato、Seiichi Inoue、Kenji Saito
DOI:10.1039/p19730002289
日期:——
A newsynthesis of vitamins K1(1), and K2(5n)(2) is described. Reaction of bis-(1–3-η-3-alkylbut-2-enyl)di-µ-bromodinickel complexes (8a–c) with 2-bromo-3-methylnaphthalene-1,4-diyl bis(methoxymethyl) ether (6a) or diacetate (6b) in a polar, co-ordinating solvent gave the corresponding vitaminK derivatives (9a–d) in high yield, which were converted into vitaminK analogues also in high yield. The
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.
Carrara; Bonacci, Gazzetta Chimica Italiana, 1943, vol. 73, p. 225,234