hydrogenchloride; triethyl phosphite in benzene 1.) room temp., overnight, 2.) room temp., overnight; Yield given;

1: SnCl4, trimethylsilyl azide / benzene / 144 h / 15 - 20 °C 2: 1.) triethyl phosphite, 2.) gas HCl / benzene / 1.) room temp., overnight, 2.) room temp., overnight View Scheme

sodium hydroxide anschliessend mit Chlorkohlensaeure-aethylester unter Kuehlung;