The required left (C1-C9) segment, (R)-2-[(2R, 5S, 6R)-6-[(R)-1-formylethyl]-5-methyltetrahydropyran-2-yl]butanoic acid, for a total synthesis of salinomycin was highly stereoselectively synthesized from D-glucose via a chelation-controlled Grignard reaction and a decarbonylation with Wilkinson's catalyst as important steps. The stereoselective synthesis of the middle (C10-C17) segment, (2R, 4S, 5S, 6R)-6-ethyl-2, 4-dimethyl-7-oxononan-5-olide, starting from D-glucose is also described.
以
D-葡萄糖为原料,通过螯合控制的格氏反应和以威尔
金森催化剂为重要步骤的脱羰基反应,高度立体选择性地合成了
盐霉素全合成所需的左侧(C1-C9)段--(R)-2-[(2R, 5S, 6R)-6-[(R)-1-甲酰基乙基]-5-甲基
四氢吡喃-2-基]
丁酸。此外,还介绍了从
D-葡萄糖开始立体选择性合成中间(C10-C17)段 (2R, 4S, 5S, 6R)-6-ethyl-2, 4-dimethyl-7-oxonan-5-olide 的过程。