Total Synthesis of (+)-Machaeriols B and C and of Their Enantiomers with a Cannabinoid Structure
作者:Hee Jin Lee、Yong Rok Lee、Sung Hong Kim
DOI:10.1002/hlca.200900014
日期:2009.7
An efficient and concise synthesis of the biologically interesting (+)‐machaeriol B (2) and its enantiomer 5 was accomplished from O‐phenylhydroxylamine (7) in four steps (Scheme 2). In addition, the first total synthesis of natural (+)‐machaeriol C (3) and its enantiomer 6 was achieved from the readily available ester 15 in eight steps (Scheme 4). The key strategies in the syntheses of 2 and 5 involved
在四个步骤中,从邻苯基羟基胺(7)高效,简捷地合成了生物学上令人感兴趣的(+)-马卡儿醇B(2)及其对映异构体5(方案2)。此外,天然的(+)-马卡儿醇C(3)及其对映异构体6的第一个全合成反应是通过容易获得的酯15分八个步骤完成的(流程4)。合成2和5的关键策略涉及通过[3,3]-σ重排和反式形成苯并呋喃多米诺醛羟醛/异狄尔斯-阿尔德反应形成的六氢二苯并吡喃。在3和6的情况下,关键步骤是通过Horner-Wadsworth-Emmons反应形成二苯乙烯,以及通过多米诺反应形成反式-六氢二苯并吡喃。