3-[3-[4-(5-Methoxy-4-pyrimidyl)-1-piperazinyl]propyl]-5-nitro-1H-indole → 3-[3-[4-(5-Methoxy-4-pyrimidyl)-1-piperazinyl]propyl]-5-amino-1H-indole

Participants

Reaction Steps

To a solution of 3-[3-[4-(5-methoxy-4-pyrimidyl)-1-piperazinyl]propyl]-5-nitroindole (0.550 g, 1.39 mmol) in a mixture of ethanol (120 mL) and THF (40 mL) was added 10% palladium-on-charcoal (0.30 g) and the mixture was hydrogenated in a Parr shaker at 40 psi for 18 h. The mixture was then filtered through Celite and the cake was washed with additional ethanol-THF. Evaporation of the filtrate gave the essentially pure title compound (0.557 g, 100 %) as a brown foam. A sample of this material (0.143 g ) was treated with excess methanolic HCl and the resulting solution was diluted with acetone to give a precipitate. The precipitate was filtered and then it was crystallized from ethanol to give 0.100 g of a purplish solid, m.p. 192° C. (dec). IR (KBr) 3410, 3200, 1630, 1540 cm-1 ; 1H NMR (DMSO-d6, 200 MHz) δ11.22 (br s, 1H), 10.20 (br s, 2H), 8.60 (d, 1H), 8.20 (s, 1H), 7.55 (d, J=1.6 Hz, 1H), 7.55 (d, J=1.6 Hz, 1H), 7.45 (d, J=8.6 Hz, 1H), 7.35 (d, J=2.1 Hz, 1H), 7.07 (dd, J=8.6, 1.9 Hz, 1H), 4.89-4.82 (m, 2H), 3.91 (s, 3H), 3.8-3.0 (br m, 8H), 2.76 (m, 2H), 2.12 (br m, 2H). Anal. Calcd. for C20H26N6O.4HCl.H2O: C., 45.29; H, 6.08; N, 15.85. Found: C., 45.32; H, 5.97; N, 15.59.

Provenance & Evidence