A conjugated addition of benzylamine to methyl (4R,5S)-4,5-(isopropylidenedioxy)-(2E)-hexenoate 8a followed by lactonization under acidic condition proceeds to the formal total syntheses of l-daunosamine 4 and l-acosamine 2. On the other hand, direct conjugated addition of benzylamine to methyl (4S,5S)-4,5-epoxy-(2E)-hexenoate 5 and the subsequent intramolecular nucleophilic attack by the ester carbonyl
将苄基胺共轭加成到甲基(4 R,5 S)-4,5-(异丙基二烯二氧基)-(2 E)-
己酸8a中,然后在酸性条件下内酯化,可以完成l-柔红胺4和l-的正式合成。
二十胺2。另一方面,将
苄胺直接共轭加成到(4 S,5 S)-4,5-环氧-(2 E)-
己酸甲酯5上,随后分子内的亲核攻击被环氧基环上的酯羰基攻击底物导致d-花生胺2和d-ristosamine 1的正式全部合成。