Multi-step reaction with 7 steps
1: 1) potassium tert-butoxide / 1) DMF, ice cooling, 0.5 h, 2) DMF, 2 h, r. t.
2: 96 percent / tetra-n-butylammonium bromide, triethylamine / Pd(OAc)2 / dimethylformamide / 24 h / Ambient temperature
3: 1) sodium hydride / 1) THF, 0 deg C, 0.5 h, 2a) THF, 0.5 h, 0 deg C, 2b) 2 h, r. t.
4: zinc(acid-washed)/CaCl2 / ethanol; H2O / 2 h / Heating
5: CH2Cl2; pyridine / 1) 0 deg C, 5 min, 2) 1 h, r. t.
6: 1) sodium hydride / 1) DMF, 0 deg C, 15 min, 2a) DMF, 15 min, 0 deg C, 2b) 1 h, r. t.
7: 54 percent / ammonium nitrate, trifluoroacetic anhydride / CH2Cl2
With
ammonium nitrate; potassium tert-butylate; tetrabutylammomium bromide; sodium hydride; triethylamine; trifluoroacetic anhydride; calcium chloride; zinc;
palladium diacetate;
In
pyridine; ethanol; dichloromethane; water; N,N-dimethyl-formamide;
DOI:10.1021/jo00009a023