Scheme 3. Substrate scope. Standard conditions: 1 (0.2 mmol, 1.0 equiv.), B2pin2 (0.24 mmol, 1.2 equiv.), CuCl (10.0 mol%), xantphos (10.0 mol%), NaOtBu (0.5 mmol, 2.5 equiv.), CO (20 bar), toluene (1.0 mL), 100 °C, 24 h; acid chlorides (0.4 mmol, 2.0 equiv.), rt, 3 h; isolated yields. Otherwise noted, the products are with only E configuration.
