Synthesis of 4-Acetylisocoumarin: First Total Syntheses of AGI-7 and Sescandelin
作者:Sanghee Kim、Gao-jun Fan、Jaekwang Lee、Jung Joon Lee、Deukjoon Kim
DOI:10.1021/jo010789b
日期:2002.5.1
A practical synthetic route to 4-acetylisocoumarins and the firsttotalsynthesis of AGI-7 (5) and sescandelin (4) are described. The readily available homophthalate 8 was transformed to the vinylogous amide ester 13 in high overall yield. Upon treatment of 13 with refluxing aqueous formic acid, the desired 4-acetylisocoumarin (5) and its regioisomer 3-methyl-4-formylisocoumarin (17) were produced