A Predictable Enantioselective Total Synthesis of (+)-Clavularin A
作者:Hilmar Weinmann、Ekkehard Winterfeldt
DOI:10.1055/s-1995-4061
日期:1995.9
Cycloadduct 9 was transformed into vinylsilane 11d in a conjugate addition-alkylation sequence. Epoxidation and subsequent hydrolysis provided the clavularin adduct 14, which on flash vacuum pyrolysis (FVP) gave (+)-clavularin A (1) in 91% yield.
环加合物 9 通过共轭加成-烷基化顺序转化为乙烯基硅烷 11d。环氧化反应和随后的水解反应产生了黄烷苷加合物 14,该加合物经闪蒸真空热解(FVP)得到了 (+)-clavularin A (1),收率为 91%。
Total synthesis of (.+-.)-clavukerin A: a new trinorguaiane sesquiterpene. Biomimetic synthesis of (.+-.)-clavularin A from (.+-.)-clavukerin A
作者:Sung Kee Kim、Chwang Siek Pak
DOI:10.1021/jo00024a024
日期:1991.11
(+/-)-Clavukerin A, 2,8-dimethylbicyclo[5.3.0]deca-5,7-diene, was first synthesized utilizing thermal [2 + 2] cycloaddition and two carbon ring expansion reactions as key elements. (+/-)-Clavukerin A was transformed, via photooxidation mimicking the biogenetic reaction, into (+/-)-clavukerin C, which was further rearranged into (+/-)-clavularin A by acid catalysis.
A stereoselective synthesis of clavularin a from 2-cycloheptenone
作者:Ian W.J Still、Yian Shi
DOI:10.1016/s0040-4039(00)95448-0
日期:1987.1
The synthesis of the naturally occurring cytotoxic compound, clavularin A(1), has been effected in seven steps, from 2-cycloheptenone. The key steps involve a double alkylation procedure and a stereoselective hydrogenation of an enone.