作者:Mark Rizzacasa、Mariana El Sous、Danny Ganame、Peter Tregloan
DOI:10.1055/s-0030-1258308
日期:2010.12
The asymmetric total synthesis of (-)-reveromycin A is described which utilizes a Lewis acid catalyzed inverse electron demand hetero-Diels-Alder reaction followed by hydroboration/oxidation to afford the labile [6,6]-spiroketal core in a highly stereoselective manner. An asymmetric syn-aldol reaction installed the stereochemistry at C4-C5 whilst a Stille cross coupling was utilized to form the C21-C22 bond. The C18 hemisuccinate was formed by high pressure acylation reaction and a final Wittig extension followed by global deprotection with tetrabutylammonium fluoride gave (-)-reveromycin A.
(-)-reveromycin A的不对称全合成方法如下:首先通过Lewis酸催化的反向电子需求杂-Diels-Alder反应,接着进行氢硼化/氧化反应,高立体选择性地获得不稳定的[6,6]-螺内酯核心结构。通过不对称顺式醛醇反应确定C4-C5的立体化学结构,而利用Stille交叉偶联反应形成C21-C22键。通过高压酰化反应形成C18半琥珀酸酯,最后进行Wittig扩展和四丁基氟化铵的全保护基去保护,得到(-)-reveromycin A。