First enantioselective total synthesis of (natural) (+)-11,12-epoxy-11,12-dihydrocembrene-C and (−)-7,8-epoxy-7,8-dihydrocembrene-C
作者:Zuosheng Liu、Weidong Z. Li、Lizeng Peng、Ying Li、Yulin Li
DOI:10.1039/b007239g
日期:——
enantioselective total syntheses of (+)-11,12-epoxy-11,12-dihydrocembrene-C 1 and (−)-7,8-epoxy-7,8-dihydrocembrene-C 2, two naturally occurring cembranoxides isolated from tropical marine soft corals, are achieved via a general approach by employing an intramolecular McMurry coupling and Sharpless asymmetric epoxidation as key steps from readily available starting materials. The syntheses presented here
11,12-环氧-11,12- dihydrocembrene-C -的第一对映选择性全合成(+)1和( - ) - 7,8-环氧-7,8- dihydrocembrene-C 2中,两个天然存在的cembranoxides分离自热带海洋软珊瑚,被实现通过一般的方法通过采用分子内的McMurry偶联和尖锐的不对称环氧化作为易于获得的起始材料的关键步骤。这里提出的合成证明了Bowden等人的1(11 S,12 S)的绝对立体化学分配。两十年前,2的环氧构型相应地假设为(7 R,8 R)。