Ipso selectivity in the reductive iodonio-Claisen rearrangement of allenyl(p-methoxyaryl)iodinanes
Abstract
Allenyl(aryl)iodinanes, generated from p-methoxy(diacetoxyiodo)arenes by the reaction with propyn-2-yl(trimethyl)silanes in the presence of BF3–Et2O in dichloromethane, undergo reductive ipso iodonio-Claisen rearrangement selectivity at –20 °C yielding ipso-substituted propynylarenes.