Hydrochloric Acid → Benzimidazole, 5,6-dichloro-2-pentafluoroethyl-

温度

108 °C

4,5-Dichloro-benzene-1,2-diamine (2.01 g; 11.4 mmoles) and 2,2,3,3,3-pentafluoro-propionic acid (1.80 mL; 17.3 mmoles) were suspended in 6N HCl (10 mL; 60 mmoles) under a nitrogen atmosphere. The reaction was stirred vigorously and heated to 108° C. for 18 hrs, then cooled to room temperature. The reaction was diluted with water (60 mL) and with ethyl acetate (60 mL), then sodium bicarbonate (7.59 g; 90.3 mmoles) was added slowly and in portions to quench the reaction. The aqueous layer was separated and extracted with ethyl acetate (3×30 mL). The extracts were combined, washed with water (30 mL) and brine (30 mL), then dried over Na2SO4. The filtrate was concentrated in vacuo to yield a crude brown solid which was then purified by column chromatography (SiO2; 100% CH2Cl2) to yield the title compound as a light tan solid.

1. temperaturecooled to room temperature
2. customto quench
3. customthe reaction
4. customThe aqueous layer was separated
5. extractionextracted with ethyl acetate (3×30 mL)
6. washwashed with water (30 mL) and brine (30 mL)
7. dry with materialdried over Na2SO4
8. concentrationThe filtrate was concentrated in vacuo
9. customto yield a crude brown solid which
10. customwas then purified by column chromatography (SiO2; 100% CH2Cl2)

ORDレコード

ord-49923246b0024809a14f270f367e14d3

出典データセット

uspto-grants-2010_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US07795446B2