1: 1.) DMSO, oxalyl chloride, 2.) Et3N / 1.) CH2Cl2, -78 deg C, 15 min, 2.) -78 deg C, 45 min 2: NaH / tetrahydrofuran / 1.) r.t., 30 min, 2.) 0 deg C, 45 min View Scheme

Yield given. Multistep reaction;

<b>Multi-step reaction with 2 steps<br /> </b>1: 2 h / 120 &deg;C<br />2: 1.) borane methyl sulfide, 2.) 3 N aq. NaOH, 30percent aq. H₂O₂ / 1.) THF, 0 deg C, 2 h; r.t., 2.5 h, 2.) EtOH, 0 deg C, 30 min; r.t., 2 h<br /> <br /> &nbsp;