反应详情

温度

-15 °C

To 13 g of (6-chloro-pyridin-3-yl)-carbamic acid, tert-butyl ester in 24 mL of tetramethylethylenediamine and 300 mL of ether at −78° C. under an inert atmosphere was added slowly 68 mL of 2.5 M n-butyllithium/hexanes (3 eq). After the addition was complete, the reaction was allowed to warm to −15° C. for two hours then recooled to −78° C. Dry ice was allowed to sublime in a separate flask and the vapor was passed over the rapidly stirred reaction mixture while the cooling bath was removed and the reaction allowed to warm to 0° C. Sufficient water was added to dissolve the precipitated product and the resultant aqueous phase was washed twice with ether before acidifying with concentrated HCl. The precipitate was filtered, washed with water, and dried in vacuo to give 10.9 g of 5-tert-butoxycarbonylamino-2-chloro-isonicotinic acid, which was used as is for the next step: melting point 250° C. and higher (slowly decomposed); mass spectrum (negative mode, m/e): M−H 271.1.

1. additionAfter the addition
2. customthen recooled to −78° C
3. customto sublime in a separate flask
4. customthe vapor was passed over the rapidly stirred reaction mixture while the cooling bath
5. customwas removed
6. temperatureto warm to 0° C
7. additionSufficient water was added
8. dissolutionto dissolve the precipitated product
9. washthe resultant aqueous phase was washed twice with ether
10. filtrationThe precipitate was filtered
11. washwashed with water
12. customdried in vacuo