作者:Lu, Yang、Cao, Tingting、Li, Kang、Lin, Ying-Wu、Zhu, Lei、Huang, Jun
DOI:10.1021/acs.orglett.4c01319
日期:——
ortho-quinone-engaged [4+2] cycloaddition. Two strategic stages were employed to prepare the highly unsaturated cycloaddition precursor 3: (1) synthesizing the diene moiety (C1–C2 and C10–C20 double bonds) by regioselective ortho-quinone tautomerization, and (2) installing four sp2-hybridized carbon atoms (C3, C5, C6 and C7) in one step using a SeO2-promoted chemo- and regioselective oxidation reaction.
Brevitaxin 由市售鼠尾草酸通过九个步骤制备而成。 1,4-苯并二恶英部分的构建涉及独特的逐步邻醌接合的[4+2]环加成。采用两个战略阶段来制备高度不饱和的环加成前体3 :(1)通过区域选择性邻醌互变异构合成二烯部分(C1-C2 和 C10-C20 双键),以及(2)安装四个sp2杂化碳使用 SeO 2促进的化学和区域选择性氧化反应一步完成原子(C3、C5、C6 和 C7)。