Synthesis of cananodine by intramolecular epoxide opening
作者:Patrick Shelton、Toby J. Ligon、Jennifer M. Dell (née Meyer)、Loagan Yarbrough、James R. Vyvyan
DOI:10.1016/j.tetlet.2017.07.080
日期:2017.8
is a guaipyridine alkaloid with activity against liver cancer. Cananodine was synthesized using a remarkable intramolecular opening of a trisubstituted epoxide as the key step in construction of the seven-membered carbocycle of the target. The epoxide opening strategy allows all four stereoisomers of cananodine to be prepared.
Palladium-catalyzed Suzuki-type couplings of 3-pyridyl triflates with alkenylpinacol boronates proceed in good to excellent yields. Optimized conditions use Pd(PPh3)4 (10 mol%) as catalyst with K3PO4 (3 equiv) as base in 1,4-dioxane.