1: 1.) t-BuLi, 2.) methanol / 1.) THF, pentane, -100 to -95 deg C, 30 min, 2.) rt 2: methanol, trifluoroacetic acid / tetrahydrofuran; pentane / 36 h / Ambient temperature View Scheme

<b>Multi-step reaction with 2 steps<br /> </b>1: N-bromosuccinimide / CCl₄ <br />2: 1.) NaH / 1.) DMF, 0 deg C, 2.) rt, 3 h<br /> <br /> &nbsp;

<b>Multi-step reaction with 3 steps<br /> </b>1: NaBH₄ <br />2: N-bromosuccinimide / CCl₄ <br />3: 1.) NaH / 1.) DMF, 0 deg C, 2.) rt, 3 h<br /> <br /> &nbsp;