Multi-step reaction with 7 steps
1: Et3N, DMAP / dimethylformamide / 1 h / Ambient temperature
2: molecular sieves 4 Angstroem / acetonitrile / 0.25 h / Ambient temperature
3: 1.) NaBH4, 2.) aq. HgCl2 / 1.) MeOH, r.t., 10 min, 2.) CH3CN, r.t., 15 min
4: toluene / 24 h / Ambient temperature
5: NiCl2*6H2O, NaBH4 / methanol / 1.) 0 deg C, 1 h, 2.) r.t., 18 h
6: 1.) NiCl2*6H2O, NaBH4, 2.) AcOH / 1.) MeOH, 0 deg C, 1 h; r.t., 18 h, 2.) toluene, reflux, 3 h
7: 75 percent / LHMDS / tetrahydrofuran; hexane / 1.) -78 deg C, 15 min, 2.) -78 to -40 deg C, 1.5 h
With
dmap; sodium tetrahydroborate; 4 A molecular sieve; acetic acid; triethylamine; mercury dichloride; nickel dichloride; lithium hexamethyldisilazane;
In
tetrahydrofuran; methanol; hexane; N,N-dimethyl-formamide; toluene; acetonitrile;
DOI:10.1021/jo00129a037