1: 90 percent / CsF / dimethylformamide; H2O / Heating 2: 69 percent / LDA / tetrahydrofuran / -78 - 20 °C 3: 77 percent / NaBH4; NaOH / methanol; H2O / 13 h / Heating View Scheme

cesium fluoride in water; N,N-dimethyl-formamide Heating;