N-ethyl-N,N-diisopropylamine in dichloromethane T=0 - 3°C; 48 h;

pyridine 24 h; Ambient temperature;

1: 90 percent / i-Pr2EtN / CH2Cl2 / 1.) 0 deg C, 3 h, 2.) 0-20 deg C, 6 h, 3.) reflux, 2 h 2: 79 percent / i-Pr2EtN / CH2Cl2 / 48 h / 0 - 3 °C View Scheme