Total Synthesis of (+)-Laurencin: An Asymmetric Alkylation−Ring-Closing Metathesis Approach to Medium Ring Ethers
作者:Michael T. Crimmins、Kyle A. Emmitte
DOI:10.1021/ol991201e
日期:1999.12.1
enantioselective total synthesis of (+)-laurencin 1 is achieved in 18 steps from (S)-(+)-4-benzyl-3-benzyloxyacetyl-2-oxazolidinone. The key steps in this synthesis are an asymmetric glycolate alkylation leading to acyl oxazolidinone 2 and a subsequent ring-closing olefin metathesis to construct the oxocene core of 1. The approach to medium ring ethers utilized in this synthesis provides a general and efficient
[式:见正文](+)-劳伦霉素1的对映选择性全合成是由(S)-(+)-4-苄基-3-苄氧基乙酰基-2-恶唑烷酮分十八步完成的。该合成过程中的关键步骤是导致酰基恶唑烷酮2的不对称乙醇酸酯烷基化反应和随后的闭环烯烃复分解反应,以构建1的茂新烯核。用于该合成反应的中环醚的方法为合成该化合物提供了一条通用而有效的途径。其他海洋天然产物的循环核心。