Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
546 48, C07D47114, C07D47122
A process for preparing S type 2-substituted hydroxy-2-indolidinyl-butyric ester compound [II]: ##STR1## wherein R.sup.0 is residue of nitrogen-containing fused heterocyclic carboxylic acid having absolute configuration of "R"(in which the nitrogen atom is protected), R.sup.1 and R.sup.2 are lower alkyl group, 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]: ##STR2## wherein the symbols are as defined above.
patent: 5053512 (1991-10-01), Wani et al.
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Stockton Laura L.
Tanabe Seiyaku Co. Ltd.
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