Total Synthesis of Yuzurine-type Alkaloid Daphgraciline

Journal of the American Chemical Society
2022.0

Abstract

The first total synthesis of daphgraciline has been achieved, which also represents the first example of the synthesis of Daphniphyllum yuzurine-type alkaloids (-,50 members). The unique bridged azabicyclo[4.3.1] ring system in the yuzurine-type subfamily was efficiently and diastereoselectively assembled via a mild type II [5+2] cycloaddition for the first time. The compact tetracyclic [6-7-5-5] skeleton was installed efficiently via an intramolecular Diels-Alder reaction, followed by a benzilic acid-type rearrangement. The synthetically challenging spiro tetrahydropyran moiety in the final product was installed diastereoselectively via a TiIII-mediated reductive epoxide coupling reaction. Potential access to enantioenriched daphgraciline is presented.

Knowledge Graph

Similar Paper