Hydrochloric Acid → tert-butyl N-(6-chloro-3-formylpyridin-2-yl)carbamate

温度

-78 °C

The reaction apparatus was dried by heating, and the reaction was carried out under argon with stirring. 15 g (65.6 mmol) of tert-butyl (6-chloropyridin-2-yl)carbamate (Example 24A) and 19 g (164 mmol) of 1,2-bis(dimethylamino)ethane were initially charged in 270 ml of THF and cooled to −78° C. 102.5 ml (164 mmol) of butyllithium (1.6N) were added dropwise. After the dropwise addition had ended, the reaction was slowly warmed to −10° C. and kept at −10° C. for 2 h. The mixture was then once more cooled to −78° C., and 10 ml (131 mmol) of DMF were added. The reaction was slowly warmed to RT, the reaction mixture was added to 1 l of ethyl acetate and 350 ml of 1N hydrochloric acid and stirred for 15 min and the organic phase was separated off. The organic phase was washed with water and saturated sodium bicarbonate solution, dried over magnesium sulfate and concentrated on a rotary evaporator. Diethyl ether was added to the residue, and the solid was filtered off with suction and dried. This gave 12.3 g (73% of theory) of the product as a solid.

1. customThe reaction apparatus was dried
2. temperatureby heating
3. additionAfter the dropwise addition
4. temperaturethe reaction was slowly warmed to −10° C.
5. temperatureThe mixture was then once more cooled to −78° C.
6. temperatureThe reaction was slowly warmed to RT
7. stirringstirred for 15 min
8. customthe organic phase was separated off
9. washThe organic phase was washed with water and saturated sodium bicarbonate solution
10. dry with materialdried over magnesium sulfate
11. concentrationconcentrated on a rotary evaporator
12. additionDiethyl ether was added to the residue
13. filtrationthe solid was filtered off with suction
14. customdried

ORDレコード

ord-2c0d7d10a01a47d5a413c14b11b99857

出典データセット

uspto-grants-2013_07

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08476267B2