Construction of the [6,5,7,5] Tetracyclic Core of Calyciphylline A Type Alkaloids via a Tandem Semipinacol Rearrangement/Nicholas Reaction
作者:Hui Shao、Wen Bao、Ze-Ran Jing、Yun-Peng Wang、Fu-Min Zhang、Shao-Hua Wang、Yong-Qiang Tu
DOI:10.1021/acs.orglett.7b02274
日期:2017.9.1
A novel and efficient approach toward the assembly of the synthetically challenging tetracyclic [6,5,7,5] core structure of calyciphylline A-type alkaloids is developed. The synthetic route features a tandem semipinacol rearrangement/Nicholas reaction that has been devised strategically to construct the spirocyclic A/Bring and the sterically congested vicinal all-carbon quaternary carbon centers in