Multi-step reaction with 8 steps
1: 1.) Bu2SnO, 2.) Et3N / 1.) MeOH, reflux, 45 min, 2.) MeOH, r.t., 15 min
2: 92 percent / LiEt3BH / tetrahydrofuran / 6 h / Ambient temperature
3: 90 percent / KH / tetrahydrofuran / 1.) 0 deg C, 15 min, 2.) r.t., 3 h
4: 95 percent / H2 / 10percent Pd/C / methanol / 16 h
5: 93 percent / TPAP, NMO, 4 Angstroem molecular sieves / CH2Cl2
6: 1.) LiCl, 2.) diisopropylethylamine / 1.) MeCN, 10 min, 2.) MeCN, 16 h
7: 63 percent / LiAlH4, S-BINAL-H / tetrahydrofuran; methanol / 16 h / -100 °C
8: 98 percent / imidazole / dimethylformamide / 16 h
With
1H-imidazole; lithium aluminium tetrahydride; N-methyl-2-indolinone; tetrapropylammonium perruthennate; (S)-BINAL-H; 4 A molecular sieve; hydrogen; potassium hydride; di(n-butyl)tin oxide; lithium triethylborohydride; triethylamine; N-ethyl-N,N-diisopropylamine; lithium chloride;
palladium on activated charcoal;
In
tetrahydrofuran; methanol; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1039/a804170i