Stereoselective Synthesis of a Building Block Corresponding to the C(1)-to-C(7) Moiety of 14-Membered Macrolide Antibiotics
作者:Marco Born、Christoph Tamm
DOI:10.1055/s-1991-26485
日期:——
The synthesis of 2′,6′-dimethylphenyl (2R,3R,4R, 5R,6S)-3-hydroxy-5,7-isopropylidenedioxy-2,4,6-trimethylheptanoate (13) a synthon for the C(1)-to-C(7) segment of a number of 14-membered macrolide antibiotics is described, starting from the meso-diester 3. Introduction of the new chiral centres was achieved by a threo-aldol condensation with the lithium 1-hydroxy-2,6 dimethylphenyl-1-propenoate (12) leading to the hydroxy ester 13. The absolute configuration of the synthon was proven by comparing the spectroscopic data and the optical rotation with the enantiomer.
2',6'-二甲基苯基 (2R,3R,4R, 5R,6S)-3-羟基-5,7-异丙叉二氧基-2,4,6-三甲基庚酸酯 (13) 的合成,C(1) 的合成子从内消旋二酯 3 开始,描述了许多 14 元大环内酯类抗生素的 C(7) 片段。通过与 1-羟基-2 锂进行苏醛醇缩合,引入了新的手性中心。 ,6 二甲基苯基-1-丙烯酸酯 (12) 生成羟基酯 13。通过与对映体比较光谱数据和旋光度,证明了合成子的绝对构型。