1-Phenethylamine → (S)-2-(2-chlorobenzyl)-3-[2-(1-phenyl-ethylamino)-pyrimidin-4-yl]-6,7-dihydro-5H-pyrazolo[1,2-a]pyrazol-1-one

HRID 1455245Notes

Reaction equation

[Cl:1][C:2]1[CH:27]=[CH:26][CH:25]=[CH:24][C:3]=1[CH2:4][C:5]1[C:12](=[O:13])[N:8]2[CH2:9][CH2:10][CH2:11][N:7]2[C:6]=1[C:14]1[CH:19]=[CH:18][N:17]=[C:16](S(C)(=O)=O)[N:15]=1.[CH3:28][CH:29]([NH2:36])[C:30]1[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=1>CN1C(=O)CCC1.CO>[Cl:1][C:2]1[CH:27]=[CH:26][CH:25]=[CH:24][C:3]=1[CH2:4][C:5]1[C:12](=[O:13])[N:8]2[CH2:9][CH2:10][CH2:11][N:7]2[C:6]=1[C:14]1[CH:19]=[CH:18][N:17]=[C:16]([NH:36][C@H:29]([C:30]2[CH:35]=[CH:34][CH:33]=[CH:32][CH:31]=2)[CH3:28])[N:15]=1

Participants

Conditions

Temperature: 90 °C

Procedure

To a solution of 2-(2-chlorobenzyl)-3-(2-methanesulfonyl-pyrimidin-4-yl)-6,7-dihydro-5H-pyrazolo[1,2-a]pyrazol-1-one, 8, (0.10 g, 0.26 mmol) in NMP (2 mL) is added alpha-methyl benzyl amine (0.10 mL, 0.78 mmol). After stirring 1.5 hours at 90° C., the reaction mixture is diluted with methanol (to 5 mL) and purified by reversed phase liquid chromatography (CH3CN/water/1% TFA) to afford 27 mg (23%) of the desired product: 1H NMR (300 MHz, CDCl3) δ 8.27 (d, J=5.1 Hz, 1H), 7.38-7.12 (m, 9H), 6.52 (d, J=5.1 Hz, 1H), 5.06 (q, br, 1H), 4.07-3.95 (m, 4H), 4.02 (s, 2H), 2.58-2.45 (m, 2H), 1.58 (d, J=7.0 Hz, 3H); ESI− MS: m/z (rel intensity) 446.0 (100, M+−H).

Workup

custompurified by reversed phase liquid chromatography (CH3CN/water/1% TFA)

Sources & evidence

ORD record: ord-1344b3f128234780b149f0ab50cade31
Source dataset: uspto-grants-2009_01
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07482356B2

Reaction notes

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