作者:Hiyoshizo Kotsuki、Tomohiro Araki、Aya Miyazaki、Mitsuhiro Iwasaki、Probal K. Datta
DOI:10.1021/ol990102y
日期:1999.8.1
[GRAPHICS]An enantioselective total synthesis of Al-77-B (1), a gastroprotective substance isolated from a culture broth of Bacillus pumilus Al- 77, was performed in high overall yield. In this synthesis, the dihydroisocoumarin part 14 and the dihydroxyamino acid part 20 were both assembled from D-ribose as the common chiral source, For the construction of 14 a bromobenzofuran derivative was used as a novel salicylic acid synthon. Finally, DEPC-mediated condensation of 14 and 20 yielded Al-77-B (1).