A Concise, Enantioselective Synthesis of (−)- and (+)-Hongconin
作者:Prashant P. Deshpande、Kenneth N. Price、David C. Baker
DOI:10.1021/jo951602h
日期:1996.1.1
Optically pure enone 9c, available in three steps from known 6-deoxy D-galactal derivative 7b, reacts with cyanophthalide 6 to directly afford the natural product (-)-hongconin (1), a compound from traditional Chinese medicine recently shown to exhibit antianginal activity. The enantiomer of 1 and its (+)-cis-diastereomer were also synthesized in a parallel fashion from the L-sugar counterpart. The
A stereoselective synthesis of a pyranonaphthoquinone derivative found in aromatic polyketide-derived aphidpigments is reported herein. This approach features the anionic [4+2]-annulation of phthalides with a carbohydrate-derived optically active enone. Additional synthetic steps provide access to the monomer fragment of uroleuconaphins and viridaphins. The optimization for a facile preparation of