Chemo-Enzymatic Total Synthesis of 3-Epiaustraline, Australine, and 7-Epialexine
作者:Alex Romero、Chi-Huey Wong
DOI:10.1021/jo000933d
日期:2000.12.1
Sequential enzymatic aldol reaction and bis-reductive amination leads to the total syntheses of tetrahydroxylated pyrrolizidine alkaloids, 3-epiaustaline (14), australine (1), and 7-epialexine (11). This approach allows for their rapid construction without the need for protecting group manipulation of the hydroxyl functionality. In addition, an improved procedure for the asymmetric epoxidation of divinyl