Total synthesis of the indolocarbazole alkaloid ZHD-0501 and its seven isomers†
Abstract
An indolocarbazole alkaloid, ZHD-0501 (1), and its 7 stereoisomers (2–8) were totally synthesized from D/L-glucose and 2,3-dibromomaleimide in 22 step reactions, and the absolute configuration of ZHD-0501 was confirmed for the first time. Compounds 1–8 showed significant inhibition against PKC α/β and the proliferation of A549, HeLa, K562 and BEL-7402 tumor cell lines.