Ethyl 4,6-dichloropyridazine-3-carboxylate → HCID 86689784, compound

HRID 1396441Notes

Reaction equation

Cl[C:2]1[CH:7]=[C:6]([Cl:8])[N:5]=[N:4][C:3]=1[C:9]([O:11][CH2:12][CH3:13])=[O:10].[CH:14]([C:17]1[N:22]=[C:21]([NH2:23])[CH:20]=[CH:19][C:18]=1[O:24][CH3:25])([CH3:16])[CH3:15]>C(#N)C>[Cl:8][C:6]1[N:5]=[N:4][C:3]([C:9]([O:11][CH2:12][CH3:13])=[O:10])=[C:2]([NH:23][C:21]2[CH:20]=[CH:19][C:18]([O:24][CH3:25])=[C:17]([CH:14]([CH3:16])[CH3:15])[N:22]=2)[CH:7]=1

Participants

Conditions

Temperature: 80 °C

Procedure

To a solution of ethyl 4,6-dichloropyridazine-3-carboxylate (747 mg, 3.38 mmol) in acetonitrile (11.3 mL) was added 6-isopropyl-5-methoxypyridin-2-amine (562 mg, 3.38 mmol) and heated to 80° C. for 20 h. The mixture was cooled and concentrated in vacuo. Purification by chromatography (silica, 10 to 50% ethyl acetate in hexanes) gave ethyl 6-chloro-4-(6-isopropyl-5-methoxypyridin-2-ylamino)pyridazine-3-carboxylate (438 mg, 1.25 mmol, 37%) as a yellow solid. 1H NMR (400 MHz, CHLOROFORM-d6) δ ppm 10.61 (s, 1H), 9.15 (s, 1H), 7.22 (d, J=8.7 Hz, 1H), 6.61 (d, J=8.7 Hz, 1H), 4.57 (q, J=7.6 Hz, 2H), 3.88 (s, 3H), 3.53 (m, 1H), 1.53 (t, J=7.0 Hz, 3H), 1.31 (d, J=6.7 Hz, 6H); MS (EI/CI) m/z: 351.0 [M+H].

Workup

temperatureThe mixture was cooled
concentrationconcentrated in vacuo
customPurification by chromatography (silica, 10 to 50% ethyl acetate in hexanes)

Sources & evidence

ORD record: ord-28772c731fa04f78b9ecef4af287990e
Source dataset: uspto-grants-2014_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08901124B2

Reaction notes

Loading…