School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.
Angew Chem Int Ed Engl. 2018 Jan 26;57(5):1346-1350. doi: 10.1002/anie.201712065. Epub 2018 Jan 9.
A convergent, nine-step (LLS), enantioselective synthesis of α-cyclopiazonic acid and related natural products is reported. The route features a) an enantioselective aziridination of an imine with a chiral sulfur ylide; b) a bioinspired (3+2)-cycloaddition of the aziridine onto an alkene; and c) installation of the acetyltetramic acid by an unprecedented tandem carbonylative lactamization/N-O cleavage of a bromoisoxazole.
报道了一种收敛的、九步(LLS)、对映选择性合成 α-环匹阿尼酸和相关天然产物的方法。该路线的特点是:a)手性硫叶立德对亚胺的对映选择性氮丙啶化;b)氮丙啶与烯烃的生物灵感(3+2)-环加成;c)通过溴代异恶唑的串联羰基化内酰胺化/N-O 裂解,以空前的方式安装乙酰四氢酸。