作者:Hao Wu、Honglu Zhang、Gang Zhao
DOI:10.1016/j.tet.2007.03.031
日期:2007.7
An enantioselective and convergent total synthesis of marine natural product pinnaic acid has been achieved. Our general synthetic approach is featured with an asymmetric hydrogenation of racemic γ-keto ester 3, a diastereoselective methylation on the α-methylene of the (1R,5R)-lactone 4, and a diastereoselective Michael addition of the tertiary nitro cyclopentane. The central azaspiro[4.5]decane was
海洋天然产物松果酸的对映选择性和聚合全合成已实现。我们的一般合成方法的特征是外消旋γ-酮酸酯3的不对称氢化,(1 R,5 R)-内酯4的α-亚甲基上的非对映选择性甲基化,以及叔硝基环戊烷的非对映选择性Michael加成。中心氮杂螺[4.5]癸烷的构建是利用δ-硝基酮的还原环化,然后用NaBH 4高度立体选择性地还原环状亚胺。最终,连续使用2-乙基膦酸丙酸三乙酯和Heathcock的磷烷18 精心制作的C5和C13侧链完成了松果酸的全合成。