Triphenylphosphine → Methyl 3-{3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]-benzyl}-2-oxo-2,3-dihydrobenzoxazole-5-carboxylate

1.84 g (9.5 mmol) of methyl 2-oxo-2,3-dihydrobenzoxazole-5-carboxylate and 4.75 g (14.25 mmol) of polymer-bound triphenylphosphine (3 mmol/g) are added to a solution of 3.03 g (10.45 mmol) of {3-[5-(3-dimethylaminopropoxy)pyrimidin-2-yl]phenyl}methanol in 40 ml of THF. The suspension is shaken at room temperature for 30 min. The suspension is cooled in an ice bath, and 3.35 g (14.25 mmol) of di-tert-butyl azodicarboxylate are added in portions. After the mixture has been stirred at room temperature for 24 h, a further 4.75 g (14.25 mmol) of polymer-bound triphenylphosphine (3 mmol/g) and 3.35 g (14.25 mmol) of di-tert-butyl azodicarboxylate are added, and the mixture is shaken at room temperature for a further 24 h. The reaction mixture is filtered, the filtrate is evaporated to dryness, and the residue is purified by column chromatography on silica gel, giving 947 mg of “A64”; m.p. 125° C., ESI: 463 (M+H); Rt=3.07 min (method C);

1. temperatureThe suspension is cooled in an ice bath
2. stirringAfter the mixture has been stirred at room temperature for 24 h
3. stirringthe mixture is shaken at room temperature for a further 24 h
4. filtrationThe reaction mixture is filtered
5. customthe filtrate is evaporated to dryness
6. customthe residue is purified by column chromatography on silica gel
7. customgiving 947 mg of “A64”

ORDレコード

ord-5484af4e463546d2b438deb6bcaeed56

出典データセット

uspto-grants-2013_04

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08431572B2