trimethylsilyl trifluoromethanesulfonate in acetonitrile 0.5 h; Ambient temperature; Yields of byproduct given;

1: 71 percent / CH2N2, BF3*OEt2 / CH2Cl2 / 0.5 h / 4 °C 2: 68 percent / trimethylsilyl trifluoromethanesulfonate / acetonitrile / 0.5 h / Ambient temperature View Scheme

ammonium hydroxide in methanol 17 h; Ambient temperature;