Multi-step reaction with 7 steps
1: 32 percent / copper bronze, K2CO3 / pyridine / 24 h / Heating
2: 1.) 5 N aq. NaOH, 2.) P2O5, methane sulfonic acid / 1.) methanol, THF, RT, 24 h, 2.) methanol, THF, RT, 24 h
3: 1.) pyridine hydrochloride, 2.) water / 1.) 180-185 deg C, 3 h, 2.) RT, 18 h
4: conc. HCl / 48 h / Heating
5: 94 percent / pivalic acid / toluene / 48 h / Heating
6: 95 percent / 1 N aq. HCl / ethyl acetate / 0.5 h / Ambient temperature
7: 62 percent / K2CO3 / butan-2-one / 18 h / Ambient temperature
With
hydrogenchloride; sodium hydroxide; methanesulfonic acid; water; pyridine hydrochloride; phosphorus pentoxide; copper; potassium carbonate;
Trimethylacetic acid;
In
pyridine; ethyl acetate; toluene; butanone;
DOI:10.1021/jm00064a006