期刊
ORGANIC & BIOMOLECULAR CHEMISTRY
卷 5, 期 8, 页码 1191-1200出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b700838d
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Two high-yielding strategies for the synthesis of 4H-anthra[1,2-b]pyran antibiotics have been developed giving access to novel antitumor agent 24 (ED50 1.5 mu M) and to (S)-espicufolin (3). A key step for the assembly of the tetracyclic 4H-anthra[1,2-b]pyran-4,7,12-trione skeleton is the nucleophilic addition of an aryl lithium species onto an aldehyde which allows the introduction of either an ynone or 1,3-diketo side chain, serving as precursors for an acid-catalysed cyclisation.
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