Hydrochloric Acid → (1S,4S)-2,5-Diazabicyclo[2.2.1]heptane-2-carboxamide hydrochloride

Participants

Reaction Steps

To a solution of (1S,4S)-2,5-Diaza-bicyclo[2.2.1]heptane-2-carboxylic acid tert-butyl ester (35.6 g, 179 mmol) in CH2Cl2 (600 mL) was added trimethylsilylisocyanate (82.5 g, 716 mmol, 4 equiv.). The reaction was stirred at rt for 2 h. After concentration, the resulting white solid was dissolved in CH2Cl2 (500 mL) and treated with a solution of HCl (4 M in dioxane, 135 mL, 3 equiv.). The solution quickly became heterogeneous. The suspension was then stirred at rt overnight. Upon concentration, the desired product was isolated as a white solid (33 g, 104%). [Note: the mass balance was found to be 104%, which arises from additional HCl that could not be removed by standard evaporation under vacuum]. 1H NMR (500 MHz, CD3OD): 4.77 (s, 1H), 4.55 (s, 1H), 3.69 and 3.64 (AB, JAB=12.1, 2H), 3.47 and 3.40 (AB, JAB=11.3, 2H), 2.22 and 2.15 (AB, JAB=11.5, 2H).

Provenance & Evidence