Cyclohexanone → HCID 118599010, compound

HRID 1050407Notes

Reaction equation

[CH3:1][C:2]1[N:7]=[C:6]([NH:8][C:9]2[CH:14]=[CH:13][N:12]=[CH:11][N:10]=2)[C:5](=[O:15])[NH:4][C:3]=1[C:16]([NH2:18])=[O:17].[C:19]1(=O)[CH2:24][CH2:23][CH2:22][CH2:21][CH2:20]1>C(#N)C.[Fe](Cl)(Cl)Cl>[CH3:1][C:2]1[N:7]=[C:6]([NH:8][C:9]2[CH:14]=[CH:13][N:12]=[CH:11][N:10]=2)[C:5](=[O:15])[N:4]2[C:19]3([CH2:24][CH2:23][CH2:22][CH2:21][CH2:20]3)[NH:18][C:16](=[O:17])[C:3]=12

Participants

Conditions

Temperature: 80 °C

Procedure

To a solution of 3-Methyl-6-oxo-5-(pyrimidin-4-ylamino)-1,6-dihydropyrazine-2-carboxamide (5, 100 mg, 0.41 mmol) and cyclohexanone (199 mg, 2.03 mmol) in acetonitrile in a 20 mL microwave vial was added iron(III) chloride (197 mg, 1.21 mmol). The reaction was heated at 80° C. for 16 h. On completion of the reaction, solvent was removed under vacuum and the crude was purified by silica gel (200-400 mesh) column chromatography eluting with 5% methanol in dichloromethane. Appropriate column fractions were concentrated under reduced pressure to afford 8′-methyl-6′-(pyrimidin-4-ylamino)-2′H-spiro[cyclohexane-1,3′-imidazo[1,5-a]pyrazine]-1′,5′-dione (Cpd. No. 216) as off white solid. Yield: 8.5 mg, 6%; MS (ESI) m/z 327.13 [M+1]+; 1H NMR (400 MHz, DMSO-d6) δ 10.17 (s, 1H), 9.11 (s, 1H), 8.88 (s, 1H), 8.72 (d, J=4.0 Hz 1H), 8.47 (d, J=4.0 Hz, 1H), 2.85-2.74 (m, 2H), 2.54 (s, 3H), 1.80-1.50 (m, 7H), 1.30-120 (m, 1H).

Workup

customOn completion of the reaction, solvent
customwas removed under vacuum
customthe crude was purified by silica gel (200-400 mesh) column chromatography
washeluting with 5% methanol in dichloromethane
concentrationAppropriate column fractions were concentrated under reduced pressure

Sources & evidence

ORD record: ord-99749f147b8d45228db81c9044d81d58
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09382248B2

Reaction notes

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