pyridine; formic acid 1.) DMF, 20 deg C, 3 h; Yield given. Multistep reaction;

1: 1.) pyridine, 2.) 60percent formic acid / 1.) DMF, 20 deg C, 3 h View Scheme

<b>With</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '472690', constants.ctx, '0')">toluene-4-sulfonic acid</a>&nbsp;<b>in</b>&nbsp; <a href="#" onclick="return RXDsubstances(event, this, '605365', constants.ctx, '0')">DMFA</a> <br />T=20&deg;C;&nbsp;24&nbsp;h;&nbsp;<br /> &nbsp;