Multi-step reaction with 11 steps
1.1: NH3 / tetrahydrofuran / -10 °C
2.1: (CF3CO)2); i-Pr2NEt / CH2Cl2 / 20 °C
3.1: NH3 / ethanol / -10 °C
4.1: 93 percent / aq. HCl; H2 / Pd/C / propan-1-ol / 6 h / 1500.12 Torr
5.1: 90 percent / aq. NaOH / methanol / 50 - 55 °C
6.1: Et3N / CH2Cl2; trifluoroacetic acid / 1 h / 20 - 25 °C
7.1: 47.3 kg / aq. HCl / propan-2-ol / 18 h
8.1: i-Pr2NEt; propane phosphonic acid anhydride / CH2Cl2; ethyl acetate / 13 h / -25 - -5 °C
9.1: 43 kg / aq. HCl / propan-2-ol / 17 h / 20 - 50 °C
10.1: aq. HCl / CH2Cl2 / pH 2 - 3
10.2: 95 percent / N-ethyl-N,N-diisopropylamine; propane phosphonic acid anhydride / ethyl acetate / 13 h / 0 - 25 °C
11.1: H2S; Et3N; pyridine / 20 °C
With
pyridine; hydrogenchloride; sodium hydroxide; 1,1,1,4,4,4-hexafluoro-2,3-butanedione; propylphosphonic anhydride; hydrogen sulfide; ammonia; hydrogen; triethylamine; N-ethyl-N,N-diisopropylamine;
palladium on activated charcoal;
In
tetrahydrofuran; methanol; propan-1-ol; ethanol; dichloromethane; ethyl acetate; isopropyl alcohol; trifluoroacetic acid;
DOI:10.1055/s-2004-831200