The diastereoselective synthesis of the simplest member of the scopadulan diterpenes, (-)-thyrsiflorin A methyl ester 10 from chiral (+)-podocarp-8(14)-en-13-one 1, of known absolute configuration, is described. A key step in our synthesis is the intramolecular cyclopropanation of the diazoketone 5 and subsequent regioselective cleavage of the cyclopropane ring.
报道了从已知绝对构型的手性(+)-罗汉松-8(14)-烯-13-酮1出发,对scopadulan二萜最简单成员(-)-thyrsiflorin A甲酯10的非对映选择性合成。我们合成中的关键步骤是二
氮酮5的分子内
环丙烷化反应,随后选择性地裂解
环丙烷环。