Diisopropylethylamine → Benzamide

Temperature

105 °C

(S)-3-(hydroxymethyl)-6a,7,8,9-tetrahydropyrido[3,2-e]pyrrolo[1,2-a]pyrazin-6(5H)-one (100 mg, 0.456 mmol), 3-chloro-N-ethyl-4-(piperazin-1-yl)benzamide hydrochloride (139 mg, 0.456 mmol), (cyanomethyl)trimethylphosphonium iodide (166 mg, 0.684 mmol) and N,N-diisopropylethylamine (0.398 ml, 2.281 mmol) were suspended in propiononitrile (Volume: 1.370 ml) and heated in a closed vial at 90-120° C. for 4 h. The reaction mixture became a dark brown solution. It was cooled to room temperature, concentrated in vacuo, dissolved in DMSO (2 mL) and purified using HPLC (basic, 10-95% ACN in water). The fractions were concentrated in vacuo and the resulting solid was recrystallized from water-methanol (5:1, 6 mL) and dried in vacuum to afford (S)-3-chloro-N-ethyl-4-(44(6-oxo-5,6,6a,7,8,9-hexahydropyrido[3,2-e]pyrrolo[1,2-a]pyrazin-3-yl)methyl)piperazin-1-yl)benzamide (75.6 mg, 0.161 mmol, 35.3% yield) as a tan solid. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.03 (t, J=7.20 Hz, 3H) 1.76-1.93 (m, 3H) 2.06-2.17 (m, 1H) 2.44-2.51 (m, 4H) 2.96 (br. s., 4H) 3.14-3.23 (m, 2H) 3.28-3.38 (m, 3H) 3.46-3.58 (m, 1H) 3.88-3.97 (m, 1H) 6.92 (d, J=2.02 Hz, 1H) 7.10 (d, J=8.34 Hz, 1H) 7.56 (d, J=1.77 Hz, 1H) 7.70 (dd, J=8.34, 2.02 Hz, 1H) 7.81 (d, J=2.27 Hz, 1H) 8.37 (t, J=5.43 Hz, 1H) 10.38 (s, 1H). [M+H] calc'd for C24H29ClN6O2, 469; found, 469.

1. temperatureIt was cooled to room temperature
2. concentrationconcentrated in vacuo
3. dissolutiondissolved in DMSO (2 mL)
4. custompurified
5. concentrationThe fractions were concentrated in vacuo
6. customthe resulting solid was recrystallized from water-methanol (5:1, 6 mL)
7. customdried in vacuum

ORD record

ord-8f907d48be824b1da9b477ffed7e04e1

Source dataset

uspto-grants-2011_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07928105B2