The total synthesis of the epimer at C-6' of the core of the complex nucleosideantibiotic miharamycin B is reported. Optimization of the N-glycosylation key step involving the atypical 2-aminopurine nucleobase and a bicyclic glycosyl donor enabled to access the N 9 -nucleoside in reasonable yield which was further decorated. The stereochemistry at C-6' has been secured by X-ray crystallography.
报道了复杂核苷抗生素米哈拉霉素 B 核心 C-6' 处差向异构体的全合成。涉及非典型 2-氨基嘌呤核碱基和双环糖基供体的 N-糖基化关键步骤的优化能够以合理的收率获得 N 9 -核苷,并进一步修饰。X 射线晶体学已确保 C-6' 的立体化学。