A Flexible Asymmetric Approach to Methyl 5-Alkyltetramates and Its Application in the Synthesis of Cytotoxic Marine Natural Product Belamide A
作者:Hong-Qiao Lan、Jian-Liang Ye、Ai-E Wang、Yuan-Ping Ruan、Pei-Qiang Huang
DOI:10.1002/chem.201002063
日期:2011.1.17
By using a methyl tetramate derivative (R)‐ or (S)‐9 as a novel chiral building block, a direct, flexible, and highly enantioselective approach to methyl (R)‐ or (S)‐5‐alkyltetramates (2) is disclosed. Among the synthesized methyl 5‐alkyltetramates 2, methyl 5‐methyltetramate (2 a) is found in cytotoxic mirabimide E (4) and dysideapyrrolidone (5), and methyl 5‐benzyltetramate (2 g) is a substructure
通过使用四甲基甲酸酯衍生物(R)‐或(S)‐9作为新型手性结构单元,可以直接,灵活且高度对映选择性地合成四甲基(R)‐或(S)‐5‐烷基四酸酯(2)。披露。在合成的5-烷基四酸甲酯2中,在细胞毒性的mirabimide E(4)和dysideapyrrolidone(5)中发现了5-甲基四酸甲酯(2 a),而5-苄基四酸甲酯(2 g)是有效的抗肿瘤药物dolastatin 15中的子结构。 (3)。在此方法的基础上,从(S)-9的七个步骤完成了抗有丝分裂四肽belamide A(7)的首次不对称合成,总收率为23.8%。不仅确认了(+)-belamide A(7)的结构和绝对构型,还确认了用于记录13 C NMR光谱,13 C NMR光谱数据相关性和天然belamide A的旋光度数据的溶剂。 (7)已被修改。