water; silver trifluoroacetate; triethylamine in tetrahydrofuran T=-25 - 20°C; 3 h;

1: ClCO2Et 2: AgO2CCF3 View Scheme

1: tetrahydrofuran; diethyl ether / 3 h / Ambient temperature 2: 71 percent / H2O, CF3CO2Ag, NEt3 / tetrahydrofuran / 3 h / -25 - 20 °C View Scheme