作者:Gerhard Riehs、Ernst Urban、Horst Völlenkle
DOI:10.1016/0040-4020(96)00428-0
日期:1996.6
blocks for the EPC synthesis of the antibiotic (+)-heptelidic acid, was determined by X-ray structure analysis. Conjugate addition of an acetal protected vinylcuprate to the 5′R configurated enoate 3n gave adduct 9n as a single diastereomer in 79% yield. Further, cleavage of the auxiliary and of the acetal protecting group from 9n were studied. Finally, we obtained the silyl protected β-ketoester 13
通过X射线结构分析确定了烯醇酸酯3n和4n的绝对构型,它们被制备为EPC合成抗生素(+)-庚二酸的手性结构单元。将缩醛保护的乙烯基铜酸酯共轭添加到5'R构型的烯酸酯3n中,以79%的收率得到作为单一非对映异构体的加合物9n。此外,还研究了从9n上裂解辅助基和缩醛保护基的方法。最后,我们获得了对映体纯形式的甲硅烷基保护的β-酮酸酯13,其是合成庚二酸的已知中间体。