Efficient Synthesis of Novel Phostone and Phostam Derivatives Regioselective Intramolecular Heck Cyclizations of (2-Iodobenzyl)buta-1,3-dienylphosphonates, (2-Iodophenyl)buta-1,3-dienylphosphonates, and -(2-Iodophenyl)--buta-1,3-dienylphosphonamidates.

Here, we report the intramolecular Heck cross-coupling of 1,3-dienylphosphonates, affording unique and regioselective access to unprecedented benzofused phostone and phostam derivatives. The reactions proceeded under operationally simple and mild conditions with a wide substrate scope.