Diisopropylethylamine → (S)-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)nicotinate

HRID 1644938Notes

Reaction equation

HRID 1644938 reaction equation
O[CH2:2][C:3]1[CH:12]=[N:11][C:10]2[N:9]3[CH2:13][CH2:14][CH2:15][CH2:16][C@H:8]3[C:7](=[O:17])[NH:6][C:5]=2[CH:4]=1.[I-].C(C[P+](C)(C)C)#N.C(N(C(C)C)C(C)C)C.[N:35]1([C:41]2[CH:51]=[CH:50][C:44]([C:45]([O:47][CH2:48][CH3:49])=[O:46])=[CH:43][N:42]=2)[CH2:40][CH2:39][NH:38][CH2:37][CH2:36]1>C(#N)CC.CCO.O>[O:17]=[C:7]1[NH:6][C:5]2[CH:4]=[C:3]([CH2:2][N:38]3[CH2:39][CH2:40][N:35]([C:41]4[CH:51]=[CH:50][C:44]([C:45]([O:47][CH2:48][CH3:49])=[O:46])=[CH:43][N:42]=4)[CH2:36][CH2:37]3)[CH:12]=[N:11][C:10]=2[N:9]2[CH2:13][CH2:14][CH2:15][CH2:16][C@@H:8]12

Participants

8

Reactant 4

HCID 81531DiisopropylethylamineHCID 10514344(Cyanomethyl)trimethylphosphanium iodideHCID 14987933Ethyl 6-(piperazin-1-yl)nicotinateHCID 58324368(S)-3-(hydroxymethyl)-7,8,9,10-tetrahydro-5H-dipyrido[1,2-a:3',2'-e]pyrazin-6(6aH)-one

Product 1

HCID 58324418(S)-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)nicotinateYield 89%

Reagents, catalysts & solvents 3

HCID 702EthanolSolventHCID 962WaterSolventHCID 7854PropionitrileSolvent

Conditions

Temperature
90 °C

Procedure

(S)-3-(hydroxymethyl)-7,8,9,10-tetrahydro-5H-dipyrido[1,2-a:3′,2′-e]pyrazin-6(6aH)-one (330 mg, 1.415 mmol) was suspended in propionitrile (3.5 mL) and (cyanomethyl)trimethylphosphonium iodide (413.0 mg, 1.70 mmol) was added followed by N-ethyl-N-isopropylpropan-2-amine (741 ul, 4.2 mmol). To the stirred mixture was then added ethyl 6-(piperazin-1-yl)nicotinate (366 mg, 1.56 mmol). The reaction was heated to 90° C. with stirring for 16 h. The reaction was then cooled to room temperature, diluted with EtOH (8 ml) and water (1 mL), then filtered. The precipitate was filtered off and dried in vacuum to afford the title compound (567 mg, 89%) as a brown solid. 1H NMR (DMSO-d6) δ (ppm): 10.48 (s, 1H), 8.63 (d, J=2.0 Hz, 1H), 7.93 (dd, J=9.1, 2.3 Hz, 1H), 7.65 (d, J=1.8 Hz, 1H), 6.97 (d, J=2.0 Hz, 1H), 6.85 (d, J=9.1 Hz, 1H), 4.44-4.56 (m, 1H), 4.24 (q, J=7.1 Hz, 2H), 3.84 (dd, J=11.4, 2.8 Hz, 1H), 3.53-3.73 (m, 4H), 3.35 (s, 2H), 2.60 (td, J=12.6, 2.5 Hz, 1H), 2.41 (t, J=4.8 Hz, 4H), 2.05 (br. s., 1H), 1.85 (d, J=12.4 Hz, 1H), 1.64 (d, J=12.4 Hz, 1H), 1.34-1.57 (m, 3H), 1.28 (t, 3H) [M+H] calc'd for C24H30N6O3, 451. found, 451

Workup

  1. temperatureThe reaction was then cooled to room temperature
  2. filtrationfiltered
  3. filtrationThe precipitate was filtered off
  4. customdried in vacuum

Sources & evidence

ORD record
ord-5389b3c2e5744ee1bfee56cf841bcdd3
Source dataset
uspto-grants-2012_02
Patent number
US08124606B2

Reaction notes

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