tert-Butyl 4-(5-nitro-1H-indol-3-yl)-5,6-dihydropyridine-1(2H)-carboxylate → tert-butyl 4-(5-amino-1H-indol-3-yl)piperidine-1-carboxylate

Participants

Reaction Steps

A mixture of 3-(N-t-butoxycarbonyl-1,2,5,6-tetrahydropyrid-4-yl)-5-nitro-1H-indole (3.55 g, 10.34 mmol) and 10% palladium on carbon (0.55 g) in absolute ethanol (60 mL) was shaken under a hydrogen atmosphere (3 atm) for 7 hours at room temperature. The resulting reaction mixture was filtered through diatomaceous earth, and the filtrate was evaporated under reduced pressure. The residual solid was triturated in diethyl ether to afford the title compound (2.56 g, 78%) as a pale pink solid: mp, decomposes 215° C.; 13C NMR (CDCl3) δ 155.0, 139.0, 131.3, 127.3, 120.4, 119.8, 112.9, 111.8, 104.1, 79.4, 44.5, 33.8, 32.7, 28.5. Anal. calcd for C18H25N3O2.1/4 H2O: C, 67.57; H, 8.03; N, 13.13. Found: C, 67.20; H, 8.07; N, 13.44.

Provenance & Evidence