Multi-step reaction with 6 steps
1: 75 percent / p-TsOH*H2O / dimethylformamide / 16 h / 60 °C
2: 1.) Ac2O, DMSO, 2.) Kieselgel 60, NaBH4 / 1.) 20 h, 2.) CH2Cl2, MeOH, 0 deg C, 30 min
3: 89 percent / mol. sieves 4A, trimethylsilyl triflate / CH2Cl2 / 1.25 h / -40 °C
4: 69 percent / mol. sieves 3A, sodium cyanoborohydride, HCl/Et2O / tetrahydrofuran / 2 h
5: 98 percent / pyridine / 16 h
6: 1.) 1,4-diazabicyclo<2.2.2>octane, tris(triphenylphosphine)rhodium(I) chloride, 2.) 1 M aq. HCl / 1.) EtOH, toluene, H2O, reflux, 2 h, 2.) acetone, reflux, 30 min
With
pyridine; 1,4-diaza-bicyclo[2.2.2]octane; hydrogenchloride; sodium tetrahydroborate; Wilkinson's catalyst; diethyl ether; trimethylsilyl trifluoromethanesulfonate; 3 A molecular sieve; 4 A molecular sieve; Kieselgel 60; acetic anhydride; sodium cyanoborohydride; toluene-4-sulfonic acid; dimethyl sulfoxide;
In
tetrahydrofuran; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1016/0008-6215(94)80060-X