The first total synthesis of the unsymmetrical bis-macrolide (-)-colletol is described. The synthesis involves a Lewis acid mediated addition of triphenylallylstannane to aldehyde 14 to set the C12 stereochemistry. The penultimate step utilized macrolactonization to assemble the 14-membered ring. The natural product was prepared in 12 linear steps and 12% overall yield.
The first total synthesis of the unsymmetrical bis-macrolide (-)-colletol is described. The synthesis involves a Lewis acid mediated addition of triphenylallylstannane to aldehyde 14 to set the C12 stereochemistry. The penultimate step utilized macrolactonization to assemble the 14-membered ring. The natural product was prepared in 12 linear steps and 12% overall yield.