摘要:
The combination of a regloselective cobalt-catalyzed 1,4-hydrovinylation and the dlastereoselective allyiboronation reaction leads to a wide scope of functionalized hydroxydienyl esters In a one-pot reaction in excellent yields. With catalytic amounts of base, these products are easily converted either into alpha,beta,gamma,delta-unsaturated hydroxyl esters or complex tetrasubstituted tetrahydropyrans In chemo- and diastereoselective fashions. In addition, a high-yielding four-component one-pot reaction involving an acrylate, two different and unsymmetrical 1,3-dienes, and an unsaturated aldehyde Is presented.