pyridine in dichloromethane 1.) 0 deg C, 1 h, 2.) RT, 1 h;

1: 98 percent / LAH / diethyl ether / 1 h / -78 °C 2: 99 percent / pyridine / CH2Cl2 / 1.) 0 deg C, 1 h, 2.) RT, 1 h View Scheme