Multi-step reaction with 6 steps
1: 68 percent / sodium hydride / dimethylformamide / 1 h / Ambient temperature
2: 1) aq. 70percent acetic acid, 2) pyridine / 1) 70 deg C, 1.5 h, 2) overnight
3: 96 percent / dimethyl(methylthio)sulfonium triflate, 2,6-di-tert-butyl-4-methylpyridine, molecular sieves / CH2Cl2 / 3 h / Ambient temperature
4: 1) hydrazine hydrate, 2) pyridine / 1) ethanol, reflux, overnight
5: 99 percent / triethylammonium fluoride / tetrahydrofuran
6: 32 percent / acetic anhydride, pyridinium dichromate / CH2Cl2 / Ambient temperature
With
pyridine; dipyridinium dichromate; 2,6-di-tert-butyl-4-methylpyridine; molecular sieve; acetic anhydride; sodium hydride; hydrazine hydrate; acetic acid; dimethyl-(methylthio)-sulphonium trifluoromethanesulphonate; triethylamine hydrofluoride;
In
tetrahydrofuran; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1016/0008-6215(92)80050-B