Methanol → HCID 57908396、化合物

350 mg (1.56 mmol) of 4-[[(6-chloropyridin-3-yl)methyl]amino]furan-2(5H)-one (Ia-1; cf. EP 0539588 A 1) and 124 mg (3.12 mmol) of a 60% dispersion of sodium hydride in mineral oil in 100 ml of tetrahydrofuran are heated under reflux for 3 h. After cooling to room temperature, 592 mg (3.12 mmol) of 3-bromo-1,1-dichloroprop-1-ene (cf. WO 8800183 A1) are added and the mixture is heated under reflux for a further 5 h. After cooling of the reaction mixture to room temperature and addition of methanol, the mixture is concentrated under reduced pressure. The residue is taken up in ethyl acetate and the mixture is washed successively twice with 1 N aqueous hydrochloric acid, twice with 1 N aqueous sodium hydroxide solution and once with saturated sodium chloride solution. The organic phase is then dried over sodium sulphate and concentrated under reduced pressure. Purification of the residue by column chromatography on silica gel (silica gel 60—Merck, particle size: 0.04 to 0.063 mm) using the mobile phase mixture ethyl acetate: cyclohexane (2:1) gives 264 mg (50% of theory) of 4-[[(6-chloropyridin-3-yl)methyl](3,3-dichloroprop-2-en-1-yl)amino]furan-2(5H)-one.

1. temperatureunder reflux for 3 h
2. temperaturethe mixture is heated
3. temperatureunder reflux for a further 5 h
4. temperatureAfter cooling of the reaction mixture to room temperature
5. concentrationthe mixture is concentrated under reduced pressure
6. washthe mixture is washed successively twice with 1 N aqueous hydrochloric acid, twice with 1 N aqueous sodium hydroxide solution and once with saturated sodium chloride solution
7. dry with materialThe organic phase is then dried over sodium sulphate
8. concentrationconcentrated under reduced pressure
9. customPurification of the residue by column chromatography on silica gel (silica gel 60—Merck, particle size: 0.04 to 0.063 mm)

ORDレコード

ord-a6673d1543ce4fcaa64d2ac1749f709f

出典データセット

uspto-grants-2013_03

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08404855B2