Multi-step reaction with 11 steps
1: NMM / tetrahydrofuran / 1 h / -10 - 20 °C
2: H2 / 10percent Pd/C / methanol
3: N,N-dimethyl-acetamide
4: H2 / 10percent Pd/C / methanol
5: 1.) 36percent aq. HCl, isopentyl nitrite, 2.) DIPEA / 1.) DMA, -10 deg C, 1.5 h, 2.) DMA, 4 deg C, 12 h
6: hydrazine monohydrate / methanol / 16 h
7: H2 / 10percent Pd/C / methanol; acetic acid
8: 1.) 36percent aq. HCl, isopentyl nitrite, 2.) DIPEA / 1.) DMF, -10 deg C, 1.5 h, 2.) DMF, 4 deg C, 5 d
9: 100 percent / gaseous HCl / diethyl ether / 0.5 h
10: 1.) HOBt, EDCI, 2.) EDCI / 1.) THF, -15 deg C, 1 h, 2.) THF, RT deg C, 8 d
11: 81 percent / KCN / methanol; ethanol / 12 h / Ambient temperature
With
4-methyl-morpholine; hydrogenchloride; potassium cyanide; hydrogen; benzotriazol-1-ol; hydrazine hydrate; N-ethyl-N,N-diisopropylamine; isopentyl nitrite;
palladium on activated charcoal;
In
tetrahydrofuran; methanol; diethyl ether; ethanol; N,N-dimethyl acetamide; acetic acid;
DOI:10.1021/ja00020a016