Hydrochloric Acid → 2-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidine-6-carbaldehyde

HRID 2359533Notes

Reaction equation

HRID 2359533 reaction equation
[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[CH:10]=[C:9]([CH:11](OCC)[O:12]CC)[N:8]([CH:18]3[CH2:22][CH2:21][CH2:20][CH2:19]3)[C:6]=2[N:7]=1.Cl.[OH-].[Na+].C([O-])(O)=O.[Na+]>O1CCOCC1>[Cl:1][C:2]1[N:3]=[CH:4][C:5]2[CH:10]=[C:9]([CH:11]=[O:12])[N:8]([CH:18]3[CH2:19][CH2:20][CH2:21][CH2:22]3)[C:6]=2[N:7]=1

Participants

6

Reactant 4

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 516892Sodium BicarbonateHCID 58315449HCID 58315449, compound

Product 1

HCID 583154052-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidine-6-carbaldehydeYield 123.2%

Reagents, catalysts & solvents 1

HCID 312751,4-DioxaneSolvent

Procedure

To a stirred solution of 2-chloro-7-cyclopentyl-6-diethoxymethyl-7H-pyrrolo[2,3-d]pyrimidine (6.29 g, 19.5 mmol) in 1,4-dioxane (68 mL) is added conc. HCl (19 mL) at room temperature. The reaction mixture is stirred for 30 minutes, then neutralized with 2N NaOH aqueous solution and saturated NaHCO3 aqueous solution. The mixture extracted into EtOAc (×3), combined organic extracts are dried (MgSO4), filtered and concentrated to give 6 g of the crude 2-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidine-6-carbaldehyde as a beige solid. To a stirred suspension of the crude 2-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidine-6-carbaldehyde in MeCN (125 mL) and H2O (125 mL) is added H2N—SO3H (6.62 g, 58.5 mmol) at room temperature. The reaction mixture is stirred for 3 hours before the pH is made >10 with 2N NaOH aqueous solution and the reaction stirred for 1 hour. The mixture extracted into dichloromethane (×3), combined organic extracts are dried (MgSO4), filtered and concentrated. The residue is purified by SiO2 chromatography, eluting with a gradient of 5% EtOAc/petrol to 20% EtOAc/petrol providing 4.00 g of 2-chloro-7-cyclopentyl-7H-pyrrolo[2,3-d]pyrimidine-6-carbonitrile as a white solid, 83% yield. MS (ESI) m/z 247.0 (M+H)+

Workup

  1. extractionThe mixture extracted into EtOAc (×3)
  2. dry with materialare dried (MgSO4)
  3. filtrationfiltered
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-43a910f2a3734b9ca2116f679e637c4d
Source dataset
uspto-grants-2014_04
Patent number
US08685980B2

Reaction notes

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