A Flexible Approach to (<i>S</i>)-5-Alkyl Tetramic Acid Derivatives: Application to the Asymmetric Synthesis of (+)-Preussin and Protected (3<i>S</i>,4<i>S</i>)-AHPPA
作者:Pei-Qiang Huang、Tian-Jun Wu、Yuan-Ping Ruan
DOI:10.1021/ol035617a
日期:2003.11.1
text] A flexible asymmetric approach to 5-alkyl tetramicacid derivatives is described, which is based on the use of 9 as the first synthetic equivalent to chiral nonracemic tetramicacid 5-carbanionic synthon 9b. The existence of the carbanion intermediate 9b was proven by trapping with trimethylchlorosilane. Application of the present method to the synthesis of antifungal alkaloid (+)-preussin, as well