A novel approach to oxazole-containing diterpenoid synthesis from plant roots: salviamines E and F
作者:Koichi Narita、Narumi Fujisaki、Yuta Sakuma、Tadashi Katoh
DOI:10.1039/c8ob03030h
日期:——
In this study, salviamines E and F, which are structurally unique abietane-type diterpene alkaloids containing an oxazole ring, were efficiently synthesized from a known molecule, 5,7,8-trimethoxy-1-naphthol. The synthetic sequence involves the following crucial steps: (i) the assembly of a carbon skeleton by coupling a six-carbon homoprenyl unit with a naphthalene moiety (Kumada–Tamao–Corriu coupling);
在这项研究中,从已知分子5,7,8-三甲氧基-1-萘酚中有效合成了Salviamines E和F,它们是结构上独特的含有恶唑环的Abetanene型二萜生物碱。合成过程包括以下关键步骤:(i)通过将六碳均异戊二烯单元与萘部分偶联来组装碳骨架(Kumada–Tamao–Corriu偶联);(ii)通过酸诱导的具有同戊二烯基侧链的萘衍生物的环化来构建三环菲环;(iii)通过2-氨基亚苯基-1,4-二基二甲酸酯或-二乙酸酯部分的亲核闭环形成恶唑环,以及(iv)在四环中间体的C13位置进行Friedel-Crafts乙酰化反应,从而获得两个靶向分子Salviamines E和F。据我们所知,