(S)-configured N-propargylprolinol ethers, coupling delivered N-(4-hydroxynon-2-ynyl)prolinol derivatives as mixtures of C4 diastereomers. Resolution of the epimers succeeded after introduction of an (R)-mandelic ester derivative and subsequent HPLC separation. Alternatively, suitable oxidation gave the corresponding alkynyl ketone. Midland reagent controlled diastereoselective reduction afforded a defined configured
从
5-甲基己醛和(S)-构型的N-炔丙基脯
氨醇醚开始,偶联递送作为C4非对映异构体的混合物的N-(
4-羟基壬-2-炔基)脯
氨醇衍
生物。引入(R)-
扁桃酸酯衍
生物并随后进行HPLC分离后,差向异构体的拆分成功。或者,适当的氧化得到相应的炔基酮。Midland试剂控制的非对映选择性还原得到定义的构型的炔
丙醇,具有高选择性。
烯丙醇的LiAlH 4还原和Mosher分析可阐明结构。适当保护的产物用作对映选择性链霉菌的关键中间体
γ-丁内酯信号分子的全合成。