Table 2. Substrate Scope for the Stereoselective Cu-Catalyzed Allylic Alkylation of β,β-Diborylacrylates 1a and 1b.

^aGeneral conditions: 1,1-diborylalkene (0.2 mmol), allyl halide (1.5 equiv), CuCl (10 mol %), PPh₃ (20 mol %), K₃PO₄ (2 equiv), THF (4 mL), 60 °C, 16 h.

^bYields determined by NMR with naphthalene as the internal standard.

^cIsolated yield.

^dNMR yield of 78%, isolated yield of 44% on a 1 mmol scale.

^eYield of 3a of 6%.

^fYield of 3b of 8%.

^gYield of 3a of 18%.

^hYield of 3a of 8%.