water; triphenylphosphine in tetrahydrofuran T=60°C;

1: 83 percent / sodium bis(2-methoxyethoxy)aluminum hydride / toluene / 1.5 h / Ambient temperature 2: 1-ethyl-3-<3-(dimethylamino)propyl>carbodiimide hydrochloride / CH2Cl2 / 4 h / Ambient temperature View Scheme

1: 83 percent / sodium bis(2-methoxyethoxy)aluminum hydride / toluene / 1.5 h / Ambient temperature 2: 1.) triethylamine, ethyl chloroformate / 1.) CHCl3, -10 deg C, 1 h, 2.)a) from -10 deg C to -5 deg C, 1 h, b) RT View Scheme