Synthesis and biological activity of thiobasidalin
摘要:
Thiobasidalin 2, the thiolactone analogue of the antibiotic basidalin 1, is synthesized starting from easily accessible thiotetronic acid 3 via a straightforward reaction sequence employing the chemoselective lithium aluminum hydride reduction of the acid pyrazolide 31 as the final key step. Antimicrobial tests reveal that thiobasidalin 2 as well as a number of its synthetic congeners display considerable activity against both eucaryontes and procaryontes. (C) Elsevier, Paris.
Free radical reactions for heterocycle synthesis. Part 3: Formation of novel spirodilactones, spirolactone-lactams, and spirolactone-thiolactones
作者:Wei Zhang
DOI:10.1016/s0040-4039(00)00256-2
日期:2000.4
Synthesis of spirodilactones is achieved by intramolecular free radical Michael addition of enol esters derivatized from tetronic acid. Synthesis of spirolactone-lactams and spirolactone-thiolactones is also covered by the scope of this new reaction.
Ureido and thioureido derivatives of 4-amino-2(5H)-furanones and 4-amino-2(5H)-thiophenones as antitumor agents
申请人:Roche Diagnostics GmbH
公开号:US06333346B1
公开(公告)日:2001-12-25
The present invention relates to ureido and thioureido derivatives of 4-amino-2(5H)-furanones and 4-amino-2(5H0-thiophenones for the treatment of tumors.
Thiono and dithio lactone analogues of 4-hydroxyfuran-2(5H)-one (tetronicacid) were synthesized in three steps from tetronicacid and thiolotetronic acid. Their usefulness in pharmacomodulation were exemplified by the synthesis ofthio analogues of 4-aza-2,3-didehydropodophyllotoxins.