Scheme 3.

Results with Tri- and Tetra-substituted Olefins^a

^aReaction conditions: alkene (0.1 mmol), phenylboronic acid (0.14 mmol), BQ(0.15 mmol), Pd(OAc)₂ (5 mol%), DMSO (1 mL), 45 °C, 3 h, unless otherwise noted; isolated yields. ^bRun at 65 °C and in DMSO (2 mL). ^cIsolated as a 5:2:4:3 mixture of isomers; 50 mM at 65 °C. ^dIsomers separated by HPLC. ^eIsolated as a 3:2:1 mixture of isomers; isomers separated by HPLC. ^fObserved by NMR.