With  tetrabutyl ammonium fluoride in  acetic acid 2 h;  Ambient temperature;  Yield given. Title compound not separated from byproducts;   

Multi-step reaction with 3 steps 1: 66 percent / imidazol, / dimethylformamide / 0.17 h2: 36 percent / DAST / various solvent(s) / 0.33 h / -105 - -80 °C3: 1 M Bu4NF / acetic acid / 2 h / Ambient temperature  

With  tetrabutyl ammonium fluoride in  acetic acid 2 h;  Ambient temperature;  Yield given. Title compound not separated from byproducts;