Multi-step reaction with 6 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: 90 percent / pyridine / CHCl3 / 1) 0 deg C, 0.5 h, 2) r. t., overnight
6: 1) potassium tert-butoxide / 1) DMF, 0 deg C, 15 min, 2a) DMF, 0 deg C, 15 min, 2b) 2 h, r. t.
With
pyridine; potassium tert-butylate; tetrabutylammomium bromide; sodium hydride; triethylamine; calcium chloride; zinc;
palladium diacetate;
In
ethanol; chloroform; water; N,N-dimethyl-formamide;
DOI:10.1021/jo00009a023