Water → HCID 178526243, compound

The commercially available 1H-pyrrolo[2,3-b]pyridine x7 (6.0 g, 50.8 mmol) is dissolved in 1,2-dimethoxyethane (50 ml). A solution of 70-75% m-chloroperbenzoic acid (17 g, 1.4 eq, 71.1 mmol) in 1,2-dimethoxyethane (40 ml) is added under cooling with cold water at a temperature below 25° C. The obtained suspension of the salt is stirred additionally for 1 h, kept overnight at −20° C. and filtered. The solid on the filter is washed with ether (2×30 ml) and air-dried. The obtained product is dissolved in a minimum of water. The pH of the solution is adjusted to 9 by the addition of aqueous K2CO3 under stirring and cooling with cold water. The formed suspension of the free N-oxide x257 is kept at +3° C. overnight and filtered. The product is washed with ice-cold water (2×10 ml) and dried over P2O5 under 1 mmHg to yield 1H-pyrrolo[2,3-b]pyridine 7-oxide x257 (3.4 g).

1. additionThe obtained suspension of the salt
2. waitkept overnight at −20° C.
3. filtrationfiltered
4. washThe solid on the filter is washed with ether (2×30 ml)
5. customair-dried
6. dissolutionThe obtained product is dissolved in a minimum of water
7. additionThe pH of the solution is adjusted to 9 by the addition of aqueous K2CO3
8. stirringunder stirring
9. temperaturecooling with cold water
10. additionThe formed suspension of the free N-oxide x257
11. waitis kept at +3° C. overnight
12. filtrationfiltered
13. washThe product is washed with ice-cold water (2×10 ml)
14. dry with materialdried over P2O5 under 1 mmHg

ORD record

ord-a29c3e0d7bdd4504a99de5fc3db33447

Source dataset

uspto-grants-2013_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08518943B2