pterocarpenes and coumestans is described. BCl3-mediated dehydrative cyclization of 1,3-diaryloxyacetones under mild conditions permitted regioselective ring closure to afford 3-((2-iodoaryloxy)methyl)benzofurans which were converted to the corresponding pterocarpenes by Pd-catalyzed intramolecular direct arylation. The subsequent benzylic oxidation led to coumestans. This sequence was applied to the formal
描述了一种高效的合成方法,可合成萜烯和
香豆素。在温和的条件下,BCl 3介导的1,3-二芳氧基
丙酮的脱
水环化使区域选择性闭环,得到3-((2-
碘芳氧基)甲基)
苯并呋喃,其通过Pd催化的分子内直接芳基化反应转化为相应的茂木。随后的苄基氧化导致
香豆素。该序列被应用于香豆
酚的形式合成和拟合成的木瓜素结构,以及
氟苯丙
胺类化合物B和C的总合成。