Total Synthesis of (+)-Erogorgiaene Using Lithiation–Borylation Methodology, and Stereoselective Synthesis of Each of Its Diastereoisomers
作者:Tim G. Elford、Stefan Nave、Ravindra P. Sonawane、Varinder K. Aggarwal
DOI:10.1021/ja207869f
日期:2011.10.26
A short (8 steps) synthesis of (+)-erogorgiaene in 44% overall yield from p-methylacetophenone is described. Key steps include lithiation/borylation-protodeboronation to build up the molecule and control the stereochemistry at C1 and C4. The C11 stereochemistry was similarly set up by using lithiation/borylation methodology. The use of a mixed, unhindered borane in the lithiation/borylation reaction
描述了从对甲基苯乙酮中以 44% 的总产率合成 (+)-erogorgiaene 的短(8 步)合成。关键步骤包括锂化/硼化-原去硼化以构建分子并控制 C1 和 C4 的立体化学。通过使用锂化/硼化方法类似地建立了 C11 立体化学。事实证明,在锂化/硼化反应中使用混合的、不受阻碍的硼烷对于四氢萘酮衍生的氨基甲酸酯控制 C4 立体化学反应的成功至关重要。试剂控制方法的力量在 (+)-erogorgiaene 的所有非对映异构体的立体控制合成中得到了说明。