A short synthesis of (±)-laurene: mechanistic reinvestigation in palladium-catalyzed cycloreductions of 1,6-enynes
作者:Chang Ho Oh、Je Wook Han、Joo Sung Kim、Sung Yong Um、Hyung Hoon Jung、Won Hyung Jang、Ho Shik Won
DOI:10.1016/s0040-4039(00)01484-2
日期:2000.10
Two palladium-catalyzed cycloreduction strategies have been applied for the synthesis of laurene. Palladium-catalyzed cyclizations of 1,6-enynes initially form the corresponding alkylpalladium intermediates. While triethylsilane could directly reduce the intermediates to lead to the corresponding cycloreduced products, the intermediates in the presence of even excess formic acid underwent β-elimination
两种钯催化的环还原策略已应用于月桂烯的合成。钯催化的1,6-烯炔的环化反应最初形成相应的烷基钯中间体。尽管三乙基硅烷可以直接还原中间体以生成相应的环还原产物,但即使在过量甲酸存在下,该中间体也经过β-消除反应生成二烯,在受阻较小的烯烃上进一步还原二烯以生成环还原产物。