Water → 6-Chloro-3,3-dimethyl-1H-pyrrolo[3,2-c]pyridin-2(3H)-one

Temperature

20 °C

To a solution of 6-chloro-3,3-dimethyl-1-(2-trimethylsilanyl-ethoxymethyl)-1,3-dihydro-pyrrolo[3,2-c]pyridin-2-one (7.25 g, 22.2 mmol) in DCM (50 mL) was added TFA (50 mL) and resulting mixture was stirred at 20° C. for 1 h. The solution was evaporated in vacuo and the residue dissolved in MeOH and solvent re-evaporated to give a solid. To an aliquot of this material (2.40 g) in THF (53 mL) was added piperazine (4.56 g, 52.9 mmol). After stirring for 1 h, water (30 mL) and EtOAc (30 mL) were added and the organic layer separated. The organic layer was washed with water (30 mL×2) and brine (30 mL), dried over Na2SO4, filtered and concentrated in vacuo. Chromatography on silica gel (gradient elution, 0-100% EtOAc/petrol), gave the title compound (1.4 g, 67%) as a colourless solid. 1H NMR (Me-d3-OD): 8.12 (1H, s), 6.99 (1H, s), 1.41 (6H, s).

1. customresulting mixture
2. customThe solution was evaporated in vacuo
3. dissolutionthe residue dissolved in MeOH
4. customsolvent re-evaporated
5. customto give a solid
6. stirringAfter stirring for 1 h
7. customthe organic layer separated
8. washThe organic layer was washed with water (30 mL×2) and brine (30 mL)
9. dry with materialdried over Na2SO4
10. filtrationfiltered
11. concentrationconcentrated in vacuo

ORD record

ord-b2b006002d1a4ad0b72d98fadc7a3fd0

Source dataset

uspto-grants-2015_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09018214B2