Efficient Synthesis of Novel Phostone and Phostam\nDerivatives <i>via</i> Regioselective Intramolecular Heck\nCyclizations of (2-Iodobenzyl)buta-1,3-dienylphosphonates, (2-Iodophenyl)buta-1,3-dienylphosphonates,\nand <i>N</i>‑

Here, we report the\nintramolecular Heck cross-coupling of 1,3-dienylphosphonates,\naffording unique and regioselective access to unprecedented benzofused\nphostone and phostam derivatives. The reactions proceeded under operationally\nsimple and mild conditions with a wide substrate scope.