Total Synthesis of Calophyline A.
Reported herein is the total synthesis of calophyline A, an indoline natural product possessing distinct ring connectivity which has not been synthesized previously. The synthetic route features several key transformations, including an aza-pinacol rearrangement to construct the nitrogen-containing bridged [3.2.2] bicycle, a Heck cyclization to assemble the fused 6/5/6/5 ring system, and a challenging late-stage aldol reaction to generate both a neopentyl quaternary stereogenic center and an oxygen-containing bridged [3.2.1] bicycle.
School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, China.
Guang
G
Li
School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, China.
Xiaoni
X
Xie
School of Pharmaceutical Sciences, Tsinghua University, Beijing, 100084, China. zuliansuo@biomed.tsinghua.edu.cn.|Collaborative Innovation Center for Biotherapy, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, 610041, China. zuliansuo@biomed.tsinghua.edu.cn.
Liansuo
L
Zu
aldol reactions; alkaloids; natural products; rearrangements; total synthesis