An Access to Chiral β-Benzyl-γ-butyrolactones and Its Application to the Synthesis of Enantiopure (+)-Secoisolariciresinol, (-)-Secoisolariciresinol, and (-)-Enterolactone
作者:Florent Allais、Paul-Henri Ducrot、Thomas Pla
DOI:10.1055/s-0030-1259982
日期:2011.5
secoisolariciresinol and enantiopure (-)-enterolactone were synthesized through a highly stereoselective convergent synthesis. An Evans diastereoselective alkylation followed by a substrate-induced diastereoselective α-alkylation of the newly formed optically active β-benzyl-γ-butyrolactone gave the β-β′ linkage of the target skeleton. The (S,S)- and (R,R)-enantiomers of secoisolariciresinol and (-)-enterolactone
通过高立体选择性会聚合成法合成了癸二异胡香脂树脂醇对映体和对映体纯(-)-内酯。Evans非对映选择性烷基化,然后是新形成的旋光性β-苄基-γ-丁内酯的底物诱导的非对映选择性α-烷基化,形成了目标骨架的β-β'键。癸二异戊二烯树脂醇的(S,S)-和(R,R)-对映异构体和(-)-对内酯的总产率分别为12-14%(11步)和20%(7步)。 全合成-天然产物-内酯-不对称-非对映选择性烷基化