(4S)-4-Ethyl-7,8-dihydro-4-hydroxy-1H-pyrano(3,4-f)indolizine-3,6,10(4H)-trione

It acts as the E-ring precursor for these topoisomerase I inhibitors. (4S)-4-Ethyl-7,8-dihydro-4-hydroxy-1H-pyrano(3,4-f)indolizine-3,6,10(4H)-trione (CAS 110351-94-5) is a key chiral intermediate employed to synthesize camptothecin analogues, specifically anti-cancer drugs like Irinotecan (CPT-11), Topotecan, and Belotecan.

API Name Irinotecan
CAS No 110351-94-5
Molecular Formula C13H13NO5
Molecular Weight 263.25 g/mol
Synonyms (4S)-4-ethyl-4-hydroxy-7,8-dihydro-1H-pyrano[3,4-f]indolizine-3,6,10-trione