title: Evaluation of paclitaxel rearrangement involving opening of the oxetane ring and migration of acetyl and benzoyl groups.
abstract: The stability of drug is a critical factor in quality control, drug efficacy, safety, storage, and production conditions. The rearrangement of paclitaxel, which involves opening of the oxetane ring and migration of acetyl group occurred on heating a powder of purified paclitaxel. Subsequently, the unusual migration of benzoyl groups progressed rapidly in organic solvents. These rearrangement derivatives were isolated carefully. The structures of the intermediate derivative A and the product derivative B were confirmed using (1)H NMR, high performance liquid chromatography (HPLC), and mass spectrometry. We proposed the rearrangement pathway here for the first time. Neither derivative exhibited bioactivity in SKOV3 (ovarian cancer) or MDA-MB-435 (breast cancer) cell culture assays.
authors.affiliation: Samyang Genex Food & Bio Research Center, 63-2 Hwaam-Dong, Yuseong-Gu, Daejeon 305-717, South Korea. shpyo@cnu.ac.kr
authors.forename: Sang-Hyun
authors.initials: SH
authors.lastname: Pyo
authors.forename: Jin-Suk
authors.initials: JS
authors.lastname: Cho
authors.forename: Ho-Joon
authors.initials: HJ
authors.lastname: Choi
authors.forename: Byung-Hee
authors.initials: BH
authors.lastname: Han
mesh_terms: D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry* / Q000494:pharmacology; D045744:Cell Line, Tumor; D002851:Chromatography, High Pressure Liquid; D005260:Female; D006801:Humans; D007202:Indicators and Reagents; D007624:KB Cells; D009682:Magnetic Resonance Spectroscopy; D017239:Paclitaxel / Q000031:analogs & derivatives* / Q000737:chemistry* / Q000494:pharmacology; D013778:Tetrazolium Salts; D013844:Thiazoles
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D007202:Indicators and Reagents; D013778:Tetrazolium Salts; D013844:Thiazoles; C022616:thiazolyl blue; D017239:Paclitaxel