Acetic Acid → HCID 178514783, compound

In a separate flask, 3-{4-[(2-aminoethyl)amino]-1,2,5-oxadiazol-3-yl}-4-[3-(trifluoromethyl)phenyl]-1,2,4-oxadiazol-5(4H)-one hydroiodide (26 mg, 0.053 mmol) was suspended in dichloromethane (0.5 mL). A nitrogen atmosphere was established and the temperature brought to 0° C. The tert-butyl [chlorosulfonyl]carbamate solution (prepared as above) was added over 5 minutes to the stirred suspension of the amine salt. After 10 minutes, triethylamine (37 μL, 0.27 mmol) was added dropwise. The reaction mixture was stirred at room temperature for 1.5 hours. After concentrating in vacuo, the residue was treated with trifluoroacetic acid (0.5 mL, 6 mmol). This was stirred for 1 hour and the mixture was again concentrated to dryness in vacuo. The dried solids were suspended in methanol (0.5 mL) and a 2.0 N NaOH in water (0.53 mL, 1.1 mmol) was added in one portion. The reaction was heated to 45° C. and stirred for 30 minutes. After neutralization with acetic acid (60 μL, 1.1 mmol), the product was purified by preparative LCMS to give the desired product (8.5 mg, 39%). LCMS calculated for C12H15F3N7O4S (M+H)+: m/z=410.0. 1H NMR (400 MHz, CD3OD): δ 7.36 (t, J=7.8 Hz, 1H), 7.23 (d, J=7.8 Hz, 1H), 7.10 (s, 1H), 7.03 (d, J=7.8 Hz, 1H), 3.48 (m, 2H), 3.29 (m, 2H).

1. custombrought to 0° C
2. concentrationAfter concentrating in vacuo
3. stirringThis was stirred for 1 hour
4. concentrationthe mixture was again concentrated to dryness in vacuo
5. temperatureThe reaction was heated to 45° C.
6. stirringstirred for 30 minutes

ORD record

ord-a6ebaf6bcb254b8ca88f5a3d3aeab7cf

Source dataset

uspto-grants-2014_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08796319B2