作者:Michael T. Crimmins、Phieng Siliphaivanh
DOI:10.1021/ol035797o
日期:2003.11.1
[reaction: see text] The enantioselective synthesis of the (+)-leucascandrolide A macrolactone has been achieved in 20 linear steps from 1,3-propanediol. The key steps in the synthesis are a reductive cleavage of bicyclic ketal 5 to establish the C15 stereogenic center and a diastereoselective aldol of the boron enolate of methyl ketone 3 to aldehyde 4 in preparation for a heteroconjugate addition
[反应:见正文](+)-二十碳四烯内酯的对映选择性合成从1,3-丙二醇以20个线性步骤完成了大内酯的合成。合成中的关键步骤是双环缩酮5的还原性裂解,以建立C15立体生成中心;甲基酮3的烯醇硼对醛4的非对映选择性醇醛,以准备引入C3立体中心的杂合物。