Efficient total synthesis of AI-77-B, A gastroprotective substance from bacillus pumilus AI-77
作者:Yasumasa Hamada、Osamu Hara、Akiyoshi Kawai、Yasushi Kohno、Takayuki Shioiri
DOI:10.1016/s0040-4020(01)82406-6
日期:1991.9
First total synthesis of AI-77-B (1), a gastroprotective substance from Bacillus pumilus AI-77, was achieved in a stereoselective and convergent manner. In this synthesis, the dihydroisocoumarin part 2 was constructed in one step through 1,2-addition of the benzylic anion 17b to Boc-L-leucinal 7b. The hydroxy amino acid 4 was elaborated from (R)-glutamic acid in a highly stereoselective manner. Condensation
以立体选择性和会聚的方式实现了AI-77-B(1)的首次全合成,这是一种来自短小芽孢杆菌AI-77的胃保护物质。在该合成中,通过将苄基阴离子17b 1,2-加成到Boc-L-亮氨酸7b中,一步构建了二氢异香豆素部分2。(R)-谷氨酸以高度立体选择性的方式修饰了羟基氨基酸4。2 ·HCl和4的缩合,分子内Pinner反应,然后温和水解,得到AI-77-B(1)。