Novel syntheses of camptothecin alkaloids, part 2. concise synthesis of (S)-camptothecins
作者:Joseph M.D Fortunak、John Kitteringham、Antonietta R Mastrocola、Mark Mellinger、Nicolas J Sisti、Jeffery L Wood、Zhi-Ping Zhuang
DOI:10.1016/0040-4039(96)01205-1
日期:1996.8
convergent total synthesis of (S)-camptothecin alkaloids is described. The intramolecular [4+2] cycloaddition of an N-arylimidate with an alkyne is used to prepare the alkaloid ABC ring system.1 The chiral center is derived utilizing Seebach's chemistry2 for the diastereoselective Michael addition of a chiral dioxolanone enolate to a methylene malonate acceptor. The total synthesis of non-racemic topotecan
描述了(S)-喜树碱生物碱的9步收敛的全合成。N-芳基亚氨酸盐与炔烃的分子内[4 + 2]环加成反应用于制备生物碱ABC环系统。1手性中心是利用Seebach的化学方法2得到的,用于将手性二氧戊环烯醇烯酸酯非对映选择性迈克尔加成到丙二酸亚甲基酯受体上。在另外的步骤中,由(S)-10-羟基喜树碱完成非外消旋拓扑替康的总合成。