A New Process for the Total Synthesis of Sparstolonin B

作者:Tang, Xiaohang; Tong, Le; Yao, Mengyi; Liang, Qiaoli; Wang, Xiaolong; Yu, Haitao*
来源:Synlett, 2017, 28(10): 1187-1190.
DOI:10.1055/s-0036-1588723

摘要

A novel and simple route was developed that gives sparstolonin B in high yields from affordable commercial compounds. A Diels-Alder strategy was used for the facile construction of the multisubstituted diphenyl ether. The xanthenone segment was obtained by cyclization in an intramolecular Friedel-Crafts reaction, followed by selective reduction of a ketone group and a transformation from a hydroxy group into a cyano group. The final part of the lactone was directly derived by the reduction of the cyano group with Raney nickel.