An Asymmetric Synthesis of the Tricyclic Core and a Formal Total Synthesis of Roseophilin via an Enyne Metathesis
作者:Barry M. Trost、George A. Doherty
DOI:10.1021/ja9941781
日期:2000.4.1
the stage for the key metathesis reaction. Platinum-catalyzed enyne metathesis via a formal [2 + 2] cycloaddition to a cyclobutene followed by conrotatory ring opening created the corresponding bicyclo[10.2.1]pentadeca-1(15),2-diene. Regioselective epoxidation of the less reactive double bond of the 1,3-diene was accomplished by 1,4-bromohydrin formation followed by base. Cuprate opening regio- and
Roseophilin 是一种具有显着抗肿瘤活性的新型五环结构,从 3-环十一碳烯基羧酸开始的正式合成已经完成。酸通过乙烯酮非对映选择性地转化为相应的薄荷醇酯,乙烯酮又提供(S)-3-环十一碳烯基甲醛。由三溴化硼和 (S,S)-二苯乙烯二胺的双-对甲苯磺酰胺原位制备的不对称硼试剂促进与炔丙基三苯基锡烷的非对映选择性炔丙基化反应得到 (1S,1'R)-1-cycloundec-2'-enylbut-3 -yn-1-ol 为关键的复分解反应奠定了基础。铂催化的烯炔复分解反应通过正式的 [2 + 2] 环加成反应到环丁烯,然后旋转开环产生相应的双环 [10.2.1]pentadeca-1(15),2-二烯。1,3-二烯的反应性较低的双键的区域选择性环氧化是通过形成1,4-溴醇,然后形成碱来完成的。铜酸盐开口区域和立体定向安装...