A Redox-Relay Heck Approach to Substituted Tetrahydrofurans.

An operationally simple and efficient strategy for the synthesis of substituted tetrahydrofurans from readily available cis -butene-1,4-diol is described. A redox-relay Heck reaction is used to rapidly access cyclic hemiacetals that can be directly reduced to afford the corresponding 3-aryl tetrahydrofuran. Furthermore, the hemiacetals can also serve as precursors to a range of disubstituted tetrahydrofurans, including the calyxolane natural products.