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