作者:Takashi Matsumoto、Sachihiko Imai、Shuhei Yuki、Masanori Mitsuki、Shigekazu Miuchi、Yasuhiro Sunaoka
DOI:10.1246/bcsj.56.290
日期:1983.1
13-(ethoxyoxalyl) derivative, which was converted into 12-hydroxypodocarpa-8,11,13-triene-13-carbaldehyde (9) by alkaline hydrolysis, decarboxylation, and demethylation. The compound 9 was also prepared from 7 by demethylation and formylation. Reduction of 9 with lithium aluminium hydride, followed by partial acetylation, afforded 13-acetoxymethyl derivative which was converted into 13-acetoxymethyl-12-methoxy
通过以下合成证实了 premnollal 的修正结构。用乙氧基草酰氯和无水氯化铝处理衍生自 12-甲氧基podocarpa-8,11,13-trien-18-oate 的 12-甲氧基podocarpa-8,11,13-triene (7),得到 13-(ethoxyoxalyl) 衍生物,通过碱水解、脱羧和去甲基化作用转化为 12-hydroxypodocarpa-8,11,13-triene-13-carbaldehyde (9)。化合物9也由7通过去甲基化和甲酰化制备。用氢化铝锂还原 9,然后部分乙酰化,得到 13-乙酰氧基甲基衍生物,通过硝化和甲基化将其转化为 13-乙酰氧基甲基-12-甲氧基-11-硝基罗汉果-8,11,13-三烯。然后通过一系列反应将其转化为 11,12-二甲氧基podocarpa-8,11,13-triene-13-carbaldehyde (18):催化氢化