Hydrochloric Acid → 1,6-Naphthyridine

温度

135 °C

A sulfuric acid solution was prepared by adding H2SO4 (100 mL) to H2O (57 mL) cooled in an ice bath. To this solution was added glycerol (33 mL, 457 mmol), m-nitrobenzene sulfonic acid sodium salt (48 g, 212 mmol) and 4-amino-pyridine (10 g, 106 mmol). The reaction mixture was heated at 135° C. for 4 hours. The cooled reaction mixture was basicified with 2.5 N NaOH (500 mL) with cooling in an ice bath, and extracted into CH2Cl2 (3×200 mL). The organic fractions were combined, dried over Na2SO4 and concentrated. The resulting oil was purified by column chromatography (5% MeOH/CH2Cl2) affording 5.04 g (36%) as a dark orange oil. An analytical sample was prepared as the HCl salt from EtOAc yielding an orange low melting solid. MS EI m/z 130 M+.

1. temperaturecooled in an ice bath
2. customThe cooled reaction mixture
3. temperaturewith cooling in an ice bath
4. extractionextracted into CH2Cl2 (3×200 mL)
5. dry with materialdried over Na2SO4
6. concentrationconcentrated
7. customThe resulting oil was purified by column chromatography (5% MeOH/CH2Cl2)
8. customaffording 5.04 g (36%) as a dark orange oil

ORDレコード

ord-6e54163d303b4fd294b682c67d1ff5b0

出典データセット

uspto-grants-2002_10

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US06465482B2