Phosphorus oxychloride → 5-Chloro-3,4-diazatricyclo(9.4.0.0,2,7)pentadeca-1(15),2(7),3,5,11,13-hexaene
Reaction equation
O=[C:2]1[NH:7][N:6]=[C:5]2[C:8]3[CH:16]=[CH:15][CH:14]=[CH:13][C:9]=3[CH2:10][CH2:11][CH2:12][C:4]2=[CH:3]1.O=P(Cl)(Cl)[Cl:19]>>[Cl:19][C:2]1[N:7]=[N:6][C:5]2[C:8]3[CH:16]=[CH:15][CH:14]=[CH:13][C:9]=3[CH2:10][CH2:11][CH2:12][C:4]=2[CH:3]=1Participants
Procedure
A mixture of the compound of formula (De), 3-oxo-6,7-dihydro-5H-benzo[6,7]cyclohepta[1,2-c]pyridazine (4.0 g, 19.3 mmol) and POCl3 (20 mL) was refluxed for 2 h. After cooling to ambient temperature, the volatiles were evaporated. The residue was poured into a mixture of ice water and sodium bicarbonate, CH2Cl2 (200 mL) was added to dissolve the solid. The layers were separated, and the aqueous layer was extracted with CH2Cl2 one more time. The combined organic layers were washed with brine. After being dried (MgSO4), filtered, and concentrated, the compound of formula (Df), 3-chloro-6,7-dihydro-5H-benzo[6,7]cyclohepta[1,2-c]pyridazine was obtained as a yellow solid (4.3 g, 99%), 1H NMR (300 MHz, CDCl3) δ: 7.82 (m, 1H), 7.45-7.24 (m, 4H), 2.59-2.51 (m, 4H), 2.27 (quant, J=6.9 Hz, 2H); LC-MS: purity: 100%; MS (m/e): 231 (MH+).
Workup
- temperaturewas refluxed for 2 h
- customthe volatiles were evaporated
- additionThe residue was poured into a mixture of ice water and sodium bicarbonate, CH2Cl2 (200 mL)
- additionwas added
- dissolutionto dissolve the solid
- customThe layers were separated
- extractionthe aqueous layer was extracted with CH2Cl2 one more time
- washThe combined organic layers were washed with brine
- dry with materialAfter being dried (MgSO4)
- filtrationfiltered
- concentrationconcentrated
Sources & evidence
- ORD record
- ord-80795921cd6f44948519a94804b25e6e
- Source dataset
- uspto-grants-2014_06
- Patent number
- US08741898B2
Reaction notes
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