HOFFMANN, H. MARTIN R.;SCHMIDT, BORIS;WOLFF, STEFAN, TETRAHEDRON, 45,(1989) N9, C. 6113-6126
作者:HOFFMANN, H. MARTIN R.、SCHMIDT, BORIS、WOLFF, STEFAN
DOI:——
日期:——
Preparation of 5-bromotetronates [4-alkoxy-5-bromo-2(5H)-furanones] and a new concept for the synthesis of aflatoxins and related structure types. Tributyltin hydride versus palladium-promoted intramolecular hydroarylation.
4-alkoxy-5-bromo-2(5H)-furanones (5-bromotetronates) (10a-e) gave precyclic aflatoxin M1 A-C building blocks (7, 14, 17c). Two cyclization modes for obtaining the ABC-moiety were investigated and compared. Whereas the Bu3SnH-induced reaction worked well for simple model compounds, it failed for the more functionalized compounds. The palladium-mediated procedure allowed the synthesis of potential aflatoxin