1: 97 percent / LiAlH4 / tetrahydrofuran / 1 h / 0 °C 2: Et3N / CH2Cl2 / 1 h / -50 °C 3: Bu4NN3 / tetrahydrofuran / 2 h 4: Bu4NN3 / tetrahydrofuran / 9 h View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: 89 percent / imidazole / tetrahydrofuran / 8 h / 23 &deg;C<br />2: 74 percent / LiClO₄ / diethyl ether / 24 h / 23 &deg;C<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: 1) n-BuLi / 1) ether, hexane, -78 deg C, 5 min, 2) a) to 23 deg C, 2 h, b) 23 deg C, 8 h<br />2: 89 percent / imidazole / tetrahydrofuran / 8 h / 23 &deg;C<br />3: 74 percent / LiClO₄ / diethyl ether / 24 h / 23 &deg;C<br /> <br /> &nbsp;