in N,N-dimethyl-formamide 0.5 h;

<b>Multi-step reaction with 6 steps<br /> </b>1: 86 percent<br />2: 91 percent / HNO₃, fuming H₂SO₄ <br />3: 5percent HCl / methanol<br />4: 80 percent / pyridine; CHCl₃ <br />5: 63 percent / HCl / dimethylformamide; various solvent(s)<br />6: 51 percent / tert.butanol<br /> <br /> &nbsp;

<b>Multi-step reaction with 2 steps<br /> </b>1: 89 percent / HNO₃ fuming<br />2: 72 percent / dimethylformamide; various solvent(s)<br /> <br /> &nbsp;