Synthesis of the Multidrug Reversal Agent Ko143 and Its Parent Natural Product Fumitremorgin C
作者:Melanie Zechner、Karl‐Heinz Altmann
DOI:10.1002/hlca.202200171
日期:2023.2
6-methoxy-l-tryptophan methyl ester from Cbz-l-aspartic acid methyl ester, m-anisidine and differently substituted benzaldehydes. With p-nitrobenzaldehyde as one of the starting materials, this route gave access to 6-methoxy-l-tryptophan methyl ester in five steps and 20 % overall yield; however, it is less efficient than a previously reported synthesis of 6-methoxy-l-tryptophan methyl ester from 6-methoxy indole
Ko143 是真菌代谢物 fumitremorgin C 的四环合成类似物。Ko143 是膜结合外排转运蛋白 ABCG2 的强效特异性抑制剂,可逆转癌细胞中 ABCG2 介导的耐药性。在这里,我们描述了 Ko143 的改进合成,它依赖于在Bischler – Napieralski反应中形成的亚胺的高选择性、底物控制还原,与衍生自 6-甲氧基-l-色氨酸甲酯和异戊酸的酰胺关键一步。我们还开发了一条从Cbz- l -天冬氨酸甲酯、间茴香胺和不同取代的苯甲醛制备6-甲氧基- l -色氨酸甲酯的新路线。和该路线以对硝基苯甲醛为起始原料,分五步得到6-甲氧基-1-色氨酸甲酯,总收率为20%;然而,它的效率低于先前报道的从 6-甲氧基吲哚合成 6-甲氧基-1-色氨酸甲酯的效率。