trifluoroacetic acid in dichloromethane

<b>Multi-step reaction with 7 steps<br /> </b>1.1: acetic acid / acetonitrile; water / 14 h / 90 &deg;C<br />2.1: 1H-imidazole; 4-(N,N-dimethlyamino)pyridine / dichloromethane / 0.5 h / 0 - 20 &deg;C<br />3.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 0.5 h / 20 &deg;C<br />4.1: lithium triethylborohydride / tetrahydrofuran / 2 h / |Inert atmosphere<br />5.1: 4-(N,N-dimethlyamino)pyridine; triethylamine / dichloromethane / 0.5 h / 20 &deg;C<br />6.1: N,O-bis-(trimethylsilyl)-acetamide / acetonitrile / 1 h / 80 &deg;C<br />6.2: 1 h / 0 - 80 &deg;C<br />7.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 1 h / 0 - 25 &deg;C<br /> <br /> &nbsp;