作者:Dieter Enders、Achim Lenzen、Michael Müller
DOI:10.1055/s-2004-822387
日期:——
The asymmetric synthesis and a formal asymmetric synthesis of (+)-strictifolione are described. As key step in both approaches the Julia-Kocienski olefination to create an E-configured alkene was used. The anti-1,3-diol moiety was synthesized by employing a SAMP-hydrazone α,α′-bisalkylation/deoxygenation protocol and the stereocentre of the lactone unit is based on an enzymatic reduction with baker’s yeast. Alternatively, a lactone precursor could be efficiently synthesized by a (S)-proline catalyzed α-oxyamination of pent-4-enal.
介绍了 (+)-strictifolione 的不对称合成和正式不对称合成。这两种方法的关键步骤都是通过 Julia-Kocienski 烯化反应生成 E 型烯烃。反-1,3-二醇分子是通过采用 SAMP-腙δ±,δ±′-双烷基化/脱氧协议合成的,而内酯单元的立体中心则是基于面包酵母的酶还原反应。另外,内酯前体也可以通过 (S)- 脯氨酸催化的戊-4-烯醛的δ-氧化反应来有效合成。