Pyridine → 4-Chloro-2-(2-chloro-1,1,1-trifluoropropan-2-YL)-1-methoxybenzene
Reaction equation
[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([O:15][CH3:16])=[C:6]([C:8](O)([CH3:13])[C:9]([F:12])([F:11])[F:10])[CH:7]=1.S(Cl)([Cl:19])=O.N1C=CC=CC=1.C(=O)(O)[O-].[Na+]>>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([O:15][CH3:16])=[C:6]([C:8]([Cl:19])([CH3:13])[C:9]([F:12])([F:11])[F:10])[CH:7]=1Participants
Conditions
- Temperature
- 40 °C
Procedure
2-(5-Chloro-2-methoxyphenyl)-1,1,1-trifluoropropan-2-ol (C45) (1.20 g, 4.71 mmol) was treated with thionyl chloride (4 mL, 50 mmol), followed by pyridine (19.1 μL, 0.236 mmol). The reaction mixture was heated at 40° C. for 16 hours, then poured into a mixture of ice and saturated aqueous sodium bicarbonate solution. The resulting mixture was extracted with dichloromethane (3×50 mL), and the combined organic layers were dried over magnesium sulfate, filtered, and concentrated under reduced pressure. The residue was determined by 1H NMR to be a mixture of product and an alkene side-product derived from elimination, in a roughly 4:1 ratio; this was used in the following step without additional purification. GCMS m/z 272 (M+). 1H NMR (400 MHz, CDCl3), product peaks only: δ 2.27 (br s, 3H), 3.86 (s, 3H), 6.90 (d, J=8.8 Hz, 1H), 7.33 (dd, J=8.8, 2.5 Hz, 1H), 7.69-7.73 (m, 1H).
Workup
- extractionThe resulting mixture was extracted with dichloromethane (3×50 mL)
- dry with materialthe combined organic layers were dried over magnesium sulfate
- filtrationfiltered
- concentrationconcentrated under reduced pressure
- additiona mixture of product
- customthis was used in the following step without additional purification
Sources & evidence
- ORD record
- ord-f51dffc9be4047d185e61d71ae283abf
- Source dataset
- uspto-grants-2015_06
- Patent number
- US09067934B2
Reaction notes
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