Table 2. Scope of the Reaction of 3a with Different Aryl Boronic Acids 4^a,b,c.

^aReaction conditions: 3a (0.134 mmol), 4 (0.16 mmol), K₂CO₃ (0.27 mmol), Pd(PPh₃)₄ (6.7 μmol), DME (1 mL), 110 °C, 24 h.

^bIsolated yields.

^cNumbers in parentheses indicate estimated yields (in reference to the starting material) according to ³¹P NMR.

^dFor fractions that, after purification, were contaminated with up to 5–7% of Ph₃P(O), the yields of products were calculated according to ¹H NMR.