Asymmetric Total Syntheses of (+)-Mycoepoxydiene and Related Natural Product (−)-1893A: Application of One-Pot Ring-Opening/Cross/Ring-Closing Metathesis to Construct Their 9-Oxabicyclo[4.2.1]nona-2,4-diene Skeleton
作者:Ken-ichi Takao、Hiroyuki Yasui、Shun Yamamoto、Daisuke Sasaki、Soujiro Kawasaki、Gohshi Watanabe、Kin-ichi Tadano
DOI:10.1021/jo048566j
日期:2004.12.1
The total syntheses of (+)-mycoepoxydiene and (−)-1893A have been completed. The present synthetic strategy features the use of one-pot ring-opening/cross metathesis (ROM/CM) followed by a ring-closing metathesis (RCM) reaction, allowing for the concise construction of the 9-oxabicyclo[4.2.1]nona-2,4-diene framework from a 7-oxabicyclo[2.2.1]hept-2-ene derivative and 1,3-butadiene. The sequential metathesis
(+)-mycoepoxydiene和(-)-1893A的总合成已完成。本合成策略的特点是使用一锅式开环/交叉易位(ROM / CM),然后进行闭环易位(RCM)反应,从而简化了9-氧杂双环[4.2.1] nona的构建由7-氧杂双环[2.2.1]庚-2-烯衍生物和1,3-丁二烯形成的-2,4-二烯构架。通过将糠醇氧化重排成吡喃酮,将顺序复分解产物转化为(+)-Mycoepoxydiene。从而建立了其绝对立体化学。从共同的中间体,还通过乙烯基醇醛醇醛醇缩合反应合成了结构上相关的天然产物(-)-1893A。