Hydrochloric Acid → HCID 71087282, compound

HRID 2405090Notes

Reaction equation

HRID 2405090 reaction equation
[Br:1][C:2]1[C:6]2[CH:7]=[N:8][C:9]([C:11]([O:13]C)=[O:12])=[CH:10][C:5]=2[N:4]([CH2:15][CH3:16])[CH:3]=1.Cl>CCO.[OH-].[Na+]>[Br:1][C:2]1[C:6]2[CH:7]=[N:8][C:9]([C:11]([OH:13])=[O:12])=[CH:10][C:5]=2[N:4]([CH2:15][CH3:16])[CH:3]=1

Participants

5

Reactant 2

HCID 313Hydrochloric AcidHCID 67353647HCID 67353647, compound

Product 1

HCID 71087282HCID 71087282, compoundYield 98%

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 14798Sodium HydroxideSolvent

Conditions

Temperature
80 °C

Procedure

A mixture of methyl 3-bromo-1-ethyl-1H-pyrrolo[3,2-c]pyridine-6-carboxylate (3A, 3.0 g, 11 mmol) in EtOH (10 ml) and 1N NaOH (10 ml) was stirred at 80° C. for 5 days. The reaction mixture was acidified with 1N HCl, concentrated in vacuo and dried to give 3-bromo-1-ethyl-1H-pyrrolo[3,2-c]pyridine-6-carboxylic acid (3B, 2.8 g, 10 mmol, 98% yield) as a pale brown powder. 1H NMR (400 MHz, DMSO-d6) δ ppm 1.42 (t, J=7.20 Hz, 3H) 4.49 (q, J=7.33 Hz, 2H) 8.35 (s, 1H) 8.65 (s, 1H) 8.91 (s, 1H). 3F In a 200 ml round bottom flask, methyl 3-bromo-1-methyl-1H-pyrrolo[3,2-c]pyridine-6-carboxylate (3E, 8.5 g, 32 mmol) was dissolved THF (50 ml) NaOH (32 ml, 63 mmol) solution was added to the mixture and the stirring continued at room temperature overnight. Another equivalent of base was added and the mixture was warmed with water bath to complete the reaction. Volatiles were removed in vacuo and the residue was cooled in an ice bath and neutralized with dilute HCl to pH 4.0-4.5. The precipitated product was collected by filtration to give the product 3-bromo-1-methyl-1H-pyrrolo[3,2-c]pyridine-6-carboxylic acid (3F, 7.3 g, 91%).

Workup

  1. concentrationconcentrated in vacuo
  2. customdried

Sources & evidence

ORD record
ord-1b4744aa8a0248f08b9171969993b7fe
Source dataset
uspto-grants-2014_08
Patent number
US08802695B2

Reaction notes

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