Enantioselective total synthesis of an antitumor antibiotic, vicenistatin, featuring a 20-membered macrocyclic lactam glycoside with the amino sugar vicenisamine, has been achieved. Key reactions in the synthesis of macrolactam aglycone involved Suzuki cross-coupling and Evans asymmetric aldol reaction. Penultimate glycosidation of the O-TMS-aglycone with appropriately protected 1-O-acetyl amino sugar and final deprotection allowed accomplishment of the total synthesis.
已完成抗肿瘤抗生素维西尼斯汀的enantioselective全合成,该化合物具有一个包含
氨基糖维西尼莎胺的20元大环内酯糖苷。在合成大环内酯非糖苷的关键反应中,涉及了铃木交叉偶联反应和埃文斯不对称 aldol 反应。O-TMS-非糖苷与适当保护的1-O-乙酰
氨基糖的倒数第二步糖苷化和最后的去保护,实现了全合成。