1: 93 percent / DDQ / toluene; tetrahydrofuran / 2 h / Heating 2: 60 percent / KOtBu / tetrahydrofuran / 50 °C View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '4267587', constants.ctx, '0')">potassium carbonate</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '635680', constants.ctx, '0')">acetone</a> <br />3&nbsp;h;&nbsp;&nbsp;Heating;&nbsp;<br /> &nbsp;