1: With sodium tetrahydroborate in ethanol T=20°C; 2: With water in dichloromethane

1.1: chloroform / Inert atmosphere 1.2: 4 - 50 °C 1.3: 1.5 h / Cooling with ice 2.1: sodium tetrahydroborate / ethanol / 12.5 h / 20 °C / Inert atmosphere 2.2: 4 - 50 °C View Scheme

1.1: n-butyllithium / hexane; diethyl ether / 1.5 h / -10 - 5 °C 1.2: 2 h / -20 - 20 °C 2.1: chloroform / Inert atmosphere 2.2: 4 - 50 °C 2.3: 1.5 h / Cooling with ice 3.1: sodium tetrahydroborate / ethanol / 12.5 h / 20 °C / Inert atmosphere 3.2: 4 - 50 °C View Scheme