Oxalyl chloride → 3-[5-(2-Fluorophenyl)-[1,2,4]oxadiazol-3-yl]benzoyl chloride

HRID 600760

Reaction equation

[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[O:12][N:11]=[C:10]([C:13]2[CH:14]=[C:15]([CH:19]=[CH:20][CH:21]=2)[C:16](O)=[O:17])[N:9]=1.C(Cl)(=O)C([Cl:25])=O>CN(C)C=O.ClCCl>[F:1][C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][C:3]=1[C:8]1[O:12][N:11]=[C:10]([C:13]2[CH:14]=[C:15]([CH:19]=[CH:20][CH:21]=2)[C:16]([Cl:25])=[O:17])[N:9]=1

Participants

Conditions

Temperature: 0 °C

Procedure

Compound 25 of the present invention may be prepared according to Scheme A as follows. A slurry of 3-[5-(2-fluorophenyl)-[1,2,4]oxadiazol-3-yl]benzoic acid (Compound A1, 15.0 g; 52.8 mmol) and 100 μL of dimethylformamide catalyst in 250 mL of anhydrous dichloromethane is allowed to cool to 0° C. Oxalyl chloride (9.2 mL, 105.5 mmol, 2.0 eq.) is added to this slurry over 3 minutes. The reaction mixture is then allowed to warm to room temperature, and is stirred for 16 h. The resultant yellow solution is concentrated in vacuo, azeotroped several times with anhydrous dichloromethane (2×50 mL) and dried under high vacuum for 2 hrs to give 15.5 g of 3-[5-(2-fluorophenyl)-[1,2,4]oxadiazol-3-yl]benzoyl chloride (Compound A2) as a white solid (97%): 1H NMR (CDCl3) δ 7.23-7.38 (m, 2H), 7.58-7.71 (m, 2H), 8.22-8.29 (m, 2H), 8.50 (d, J=7.8 Hz, 1H), 8.91 (t, J=1.6 Hz, 1H).

Workup

temperatureto warm to room temperature
concentrationThe resultant yellow solution is concentrated in vacuo
customazeotroped several times with anhydrous dichloromethane (2×50 mL)
customdried under high vacuum for 2 hrs

Sources & evidence

ORD record: ord-54c0da07b7874850b1b5b825fcbc15d1
Source dataset: uspto-grants-2011_03
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07902235B2

Linked notes

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