Table 1.
1a (1 equiv), 2a (2 equiv), CsF (2 equiv), 18-crown ether-6 (2 equiv), base (30 mol %), THF (0.15 M in 1a), 23 °C, 3 h.
reactions performed at −18 °C for 12 h. Er was determined by chiral stationary-phase high performance liquid chromatography (HPLC). Mes, 2,4,6-Me-C6H2.