Ethylamine hydrochloride → (S)-N-ethyl-6-(4-((6-oxo-6,6a,7,8,9,10-hexahydro-5H-dipyrido[1,2-a:3',2'-e]pyrazin-3-yl)methyl)piperazin-1-yl)nicotinamide

Participants

Reaction Steps

(S)-6-(4-((6-oxo-6,6a,7,8,9,10-hexahydro-5H-dipyrido[1,2-a:3′,2′-e]pyrazin-3-yl)methyl)piperazin-1-yl)nicotinic acid (75 mg, 0.178 mmol) was taken up in DMF (0.9 mL). To the mixture was added N-ethyl-N-isopropylpropan-2-amine (93 μl, 0.53 mmol), O-(7-Azabenzotriazole-1-yl)-N,N,N′N′-tetramethyluronium hexafluorophosphate (101 mg, 0.266 mmol), and ethanamine hydrochloride (15.9 mg, 0.195 mmol). The reaction was stirred at room temperature overnight. The reaction was purified via HPLC (10-80 MeCN/H2O, TFA buffered). The fractions were collected and lyophilized to yield 27.4 mg (34%) of the title compound as a white solid. 1H NMR (DMSO-d6) δ (ppm): 10.84 (s, 1H), 10.03 (br. s., 1H), 8.64 (s, 1H), 8.35 (t, J=5.2 Hz, 1H), 8.04 (d, J=9.1 Hz, 1H), 7.83 (s, 1H), 6.90-7.11 (m, 2H), 4.40-4.71 (m, 3H), 4.26 (s, 2H), 3.98 (d, J=11.1 Hz, 1H), 2.96-3.57 (m, 8H), 2.61-2.74 (m, 1H), 2.08 (d, J=11.9 Hz, 1H), 1.87 (d, J=12.4 Hz, 1H), 1.33-1.73 (m, 4H), 1.11 (t, 3H). [M+H] calc'd for C24H31N7O2, 450; found, 450.

Provenance & Evidence