Sodium Bicarbonate → HCID 90112828, compound

HRID 1508772Notes

Reaction equation

Cl.Cl[C:3]1[CH:8]=[C:7]([C:9]2[CH:14]=[CH:13][CH:12]=[C:11]([Cl:15])[CH:10]=2)[N:6]=[C:5]2[CH2:16][CH2:17][CH2:18][C:4]=12.[NH2:19][C:20]1[CH:39]=[CH:38][C:23]([CH2:24][CH:25]([C:32]([O:34][CH:35]([CH3:37])[CH3:36])=[O:33])[C:26]([O:28][CH:29]([CH3:31])[CH3:30])=[O:27])=[CH:22][CH:21]=1.C(=O)(O)[O-].[Na+]>Cl.CN1C(=O)CCC1.O>[Cl:15][C:11]1[CH:10]=[C:9]([C:7]2[N:6]=[C:5]3[CH2:16][CH2:17][CH2:18][C:4]3=[C:3]([NH:19][C:20]3[CH:21]=[CH:22][C:23]([CH2:24][CH:25]([C:26]([O:28][CH:29]([CH3:31])[CH3:30])=[O:27])[C:32]([O:34][CH:35]([CH3:36])[CH3:37])=[O:33])=[CH:38][CH:39]=3)[CH:8]=2)[CH:14]=[CH:13][CH:12]=1

Participants

Conditions

Temperature: 140 °C

Procedure

A 10-mL microwave vial was charged with 4-chloro-2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridine hydrochloride (0.070 g, 0.23 mmol), diisopropyl 2-(4-aminobenzyl)malonate (0.136 g, 0.47 mmol) and conc. HCl (1 drop) in NMP (3 mL). The resulting mixture was heated at 140° C. under microwave irradiation for 2 h. After this time, the reaction mixture was cooled, diluted with water (15 mL), and then treated with saturated sodium bicarbonate until pH˜8. The resulting solid was isolated by filtration and purified by preparative HPLC (water/acetonitrile with 0.05% TFA) followed by chromatography on silica using hexanes/ethyl acetate (10:0 to 0:10) as eluent to afford diisopropyl 2-(4-((2-(3-chlorophenyl)-6,7-dihydro-5H-cyclopenta[b]pyridin-4-yl)amino)benzyl)malonate (0.046 g, 38%) as an off-white solid. MW=521.05. 1H NMR (DMSO-d6, 500 MHz) δ 8.14 (s, 1H), 7.86 (s, 7.89-7.84 (m, 1H), 7.46-7.38 (m, 2H), 7.25-7.12 (m, 5H), 4.94-4.84 (m, 2H), 3.78-3.72 (m, 1H), 3.04 (d, J=7.5 Hz, 2H), 2.93-2.87 (m, 2H), 2.85-2.77 (m, 2H), 2.12-2.03 (m, 2H), 1.15 (d, J=5.5 Hz, 6H), 1.11 (d, J=5.5 Hz, 6H). MS: ESI, m/z 521 [M+H]+. Treatment with 1.25M HCl in methanol (0.11 mL, 0.13 mmol, 1.5 eq.) afforded the title compound (0.043 g, 88%) as an off-white solid. MW=557.51. M.p. 68-70° C. 1H NMR (DMSO-d6, 500 MHz) δ 13.93 (br s, 1H), 7.86-7.84 (m, 1H), 7.67 (d, J=8.0 Hz, 1H), 7.62-7.50 (m, 2H), 7.34-7.24 (m, 4H), 6.97 (s, 1H), 4.88 (sept, J=6.0 Hz, 2H), 3.79 (t, J=7.5 Hz, 1H), 3.12-3.03 (m, 4H), 2.87 (t, J=7.5 Hz, 2H), 2.23-2.15 (m, 2H), 1.14 (d, J=5.0 Hz, 6H), 1.09 (d, J=5.5 Hz, 6H); ESI MS m/z 451 [M+H]+.

Workup

temperatureAfter this time, the reaction mixture was cooled
customThe resulting solid was isolated by filtration
custompurified by preparative HPLC (water/acetonitrile with 0.05% TFA)

Sources & evidence

ORD record: ord-9ddae3f8e13e42e785bd992028c161ea
Source dataset: uspto-grants-2015_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09221843B2

Reaction notes

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