Scheme 284. Synthesis of a Sulfur-Hybridized Pyracylene Derivative and an Unexpected Aryl Shift during Oxidative Cyclization,
Reagents and conditions: (a)529 FeCl3, DCM/MeNO2, 5 min; (b) phenylboronic acid, K2CO3, Pd(PPh3)4, THF/H2O, N2, dark, 70 °C, overnight.
Two corresponding carbon atoms (A and B) of compounds 284.4 and 284.5 are labeled in blue for a better understanding.