1: trifluoroacetic acid / dichloromethane 2: N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 60 °C View Scheme

1: trifluoroacetic acid / dichloromethane 2: N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 60 °C View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: N-ethyl-N,N-diisopropylamine / tetrahydrofuran / 2 h / 20 &deg;C / Inert atmosphere<br />2: N-ethyl-N,N-diisopropylamine / acetonitrile / 0.25 h / 0 - 20 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: triethylamine / diethyl ether / 0.75 h<br />2: diethyl ether; toluene / 1 h / 0 - 20 &deg;C<br />3: N-ethyl-N,N-diisopropylamine / acetonitrile / 0.25 h / 0 - 20 &deg;C<br /> <br /> &nbsp;