S type 2-substituted hydroxy-2-indolidinylbutyric ester compounds and process for preparation thereof
申请人:TANABE SEIYAKU CO., LTD.
公开号:US20030135049A1
公开(公告)日:2003-07-17
A process for preparing S type 2-substituted hydroxy-2-indolidinylbutyric ester compound [II]:
1
wherein R
o
is residue of nitrogen-containing fused heterocyclic carboxylic acid having absolute configuration of “R” (in which the nitrogen atom is protected), R1 and R2 are lower alkyl groups, and E is ester residue, which is useful as an intermediate for preparing camptothecin derivatives having antitumor activities, which comprises 2-ethylating 2-substituted hydroxy-2-indolidinylacetic ester compound [I]:
2
wherein the symbols are as defined above.
一种制备S型2-取代羟基-2-吲哚丁酸酯化合物II的方法:其中Ro是氮杂环羧酸残基,具有“R”的绝对构型(其中氮原子受保护),R1和R2是较低的烷基基团,E是酯残基,该化合物是制备具有抗肿瘤活性的喜树碱衍生物的中间体,包括对2-取代羟基-2-吲哚丁酸乙酯化合物I进行2-乙基化,其中符号如上所定义。