Multi-step reaction with 8 steps
1.1: 97 percent / methanesulfonic acid / methanol / 3 h / 40 °C
2.1: dioxane / 24 h / 20 °C
2.2: 64 percent / HCl / dioxane / 24 h / 20 °C
3.1: 94 percent / pyridine / 0.25 h / 0 °C
4.1: 61 percent / phenyliodine(III) bis(trifluoroacetate) / 2,2,2-trifluoro-ethanol / 0.17 h / -40 °C
5.1: 95 percent / BCl3 / CH2Cl2 / 20 h / -78 °C
6.1: 83 percent / pyridine / 3 h / 0 °C
7.1: 98 percent / formic acid; Et3N; PPh3 / Pd(OAc)2 / dimethylformamide / 72 h / 60 °C
8.1: 78 percent / lithium tri-sec-butylborohydride / tetrahydrofuran / 3 h / -78 °C
With
pyridine; formic acid; methanesulfonic acid; boron trichloride; L-Selectride; triethylamine; triphenylphosphine; bis-[(trifluoroacetoxy)iodo]benzene;
palladium diacetate;
In
tetrahydrofuran; 1,4-dioxane; methanol; dichloromethane; 2,2,2-trifluoroethanol; N,N-dimethyl-formamide;
5.1: Michael addition;
DOI:10.1248/cpb.54.1662