tert-Butanol → tert-Butyl (2-bromo-[1,2,4]triazolo[1,5-a]pyridin-7-yl)carbamate

Triethylamine (0.39 ml), MS4A (1.5 g), and diphenyl phosphate azide (0.18 ml) were added to a tert-butanol (5 ml) solution of the 2-bromo-[1,2,4]triazolo[1,5-a]pyridine-7-carboxylate (0.17 g) obtained in (Example 3.15) <Step 3>. The obtained mixture was stirred at room temperature for 1 hour, and then at 100° C. for 2 hours. Thereafter, ethyl acetate (50 ml) was added to the reaction solution, and the mixed solution was then filtered with Celite. The filtrate was washed with a saturated sodium hydrogen carbonate aqueous solution (20 ml), and was then dried over anhydrous sodium sulfate. The solvent was distilled away under reduced pressure, and the obtained residue was then purified by silica gel column chromatography (silica gel:eluent; heptane:ethyl acetate=75:25-50:50), so as to obtain the title compound (0.15 g) in a white amorphous form.

1. customobtained in (Example 3.15) <Step 3>
2. waitat 100° C. for 2 hours
3. filtrationthe mixed solution was then filtered with Celite
4. washThe filtrate was washed with a saturated sodium hydrogen carbonate aqueous solution (20 ml)
5. dry with materialwas then dried over anhydrous sodium sulfate
6. distillationThe solvent was distilled away under reduced pressure
7. customthe obtained residue was then purified by silica gel column chromatography (silica gel:eluent; heptane:ethyl acetate=75:25-50:50)

ORD-Eintrag

ord-8520afef55394953ae653d2f830087d7

Quelldatensatz

uspto-grants-2016_09

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09440970B2