Diisopropylamine → 6-Chloro-3-methyl[1,2]thiazolo[5,4-b]pyridine

A solution of triphosgene (190 mmol) in dichloromethane (200 mL) was added dropwise over 20 min to a solution of 3-methylisothiazolo[5,4-b]pyridine-N-oxide (47.4 mmol) in dichloromethane (150 mL) at −20° C. A solution of diisopropylamine (190 mmol) in dichloromethane (200 mL) was added dropwise over 1 h. The reaction mixture was allowed to warm to rt and was maintained for 16 h. The reaction mixture was quenched with water (40 mL) of water and the pH was adjusted to 7 by the addition of 10% sodium hydroxide. The organic layer was washed with water (100 mL). The combined aqueous layers were extracted with dichloromethane (10×100 mL) and the combined organic layers were dried (magnesium sulfate) and concentrated. The residue was purified by chromatography (1/80 ethyl acetate/petroleum ether) to provide 6-chloro-3-methylisothiazolo[5,4-b]pyridine in 46% yield as a colorless solid.

1. temperaturewas maintained for 16 h
2. customThe reaction mixture was quenched with water (40 mL) of water
3. additionthe pH was adjusted to 7 by the addition of 10% sodium hydroxide
4. washThe organic layer was washed with water (100 mL)
5. extractionThe combined aqueous layers were extracted with dichloromethane (10×100 mL)
6. dry with materialthe combined organic layers were dried (magnesium sulfate)
7. concentrationconcentrated
8. customThe residue was purified by chromatography (1/80 ethyl acetate/petroleum ether)

ORD record

ord-84e7e91d7ebd44fe94513da1df22d413

Source dataset

uspto-grants-2012_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08106066B2