Table 1.
Conditions: 1a (0.1 mmol), Pd(OAc)2 (10 mol%), ligand (L) (20 mol%), Na2CO3 (1.0 eq), Ac2O (2.0 eq), TBHP (70% in water) (2.0 eq), HFIP, 60 °C, 12 h.
The yields were determined by 1H NMR analysis of the crude product using CH2Br2 as the internal standard.
TBHP (~5.5 M in decane) (2.0 eq), isolated yield of the corresponding methyl ester.