Multi-step reaction with 11 steps
1.1: 80 percent / NaBH4 / tetrahydrofuran / 16 h / 20 °C
2.1: aq. Cs2CO3 / acetone / 3 h / Heating
2.2: 60 percent / dimethylformamide / 24 h / 20 °C
3.1: 95 percent / DIEA; DMAP / dimethylformamide / 24 h / 20 °C
4.1: 100 percent / H2 / Pd/C / ethyl acetate / 1 h / 20 °C / 2280 Torr
5.1: 100 percent / pyridine / dimethylformamide / 0.75 h / 20 °C
6.1: 70 percent / DIEA; DMAP / dimethylformamide / 16 h / 20 °C
7.1: 92 percent / H2 / Pd/C / ethyl acetate / 1 h / 20 °C / 2280 Torr
8.1: 95 percent / pyridine / dimethylformamide / 0.75 h / 20 °C
9.1: 50 percent / DIEA; DMAP / dimethylformamide / 16 h / 20 °C
10.1: 92 percent / H2 / Pd/C / ethyl acetate / 1 h / 20 °C / 2280 Torr
11.1: 95 percent / pyridine / dimethylformamide / 0.75 h / 20 °C
With
pyridine; dmap; sodium tetrahydroborate; hydrogen; caesium carbonate; N-ethyl-N,N-diisopropylamine;
palladium on activated charcoal;
In
tetrahydrofuran; ethyl acetate; N,N-dimethyl-formamide; acetone;
DOI:10.1039/b405856a