1: KOH / ethanol / 0.25 h / Heating 2: 90 percent / triethylamine, ethyl carbonochloridate / benzene / 0.25 h / Heating View Scheme

hydrogen; lt;Rh((R)-cycphos)(NBD)gt;PF6 in tetrahydrofuran T=25°C; P=760 Torr; effects of catalysts, and solvents dependence of the optical yields, effect of added of NEt3;