Hydrochloric Acid → (S)-3-(3-Hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylic acid

HRID 716971Notes

Reaction equation

HRID 716971 reaction equation
[OH:1][C@H:2]1[CH2:6][CH2:5][N:4]([C:7]2[C:8]([C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)=[N:9][C:10]3[C:15]([N:16]=2)=[CH:14][C:13]([C:17]([O:19]C)=[O:18])=[CH:12][CH:11]=3)[CH2:3]1.[OH-].[Na+].Cl>CO.O>[OH:1][C@H:2]1[CH2:6][CH2:5][N:4]([C:7]2[C:8]([C:21]3[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=3)=[N:9][C:10]3[C:15]([N:16]=2)=[CH:14][C:13]([C:17]([OH:19])=[O:18])=[CH:12][CH:11]=3)[CH2:3]1

Participants

6

Reactant 3

HCID 313Hydrochloric AcidHCID 14798Sodium HydroxideHCID 67980621(S)-methyl 3-(3-hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylate

Product 1

HCID 50991114(S)-3-(3-Hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylic acid

Reagents, catalysts & solvents 2

HCID 887MethanolSolventHCID 962WaterSolvent

Procedure

Into a 50-mL round-bottom flask, was placed a solution of (S)-methyl 3-(3-hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylate (170 mg, 0.49 mmol, 1.00 equiv) in methanol (20 mL). This was followed by the dropwise addition of a solution of sodium hydroxide (97.4 mg, 2.44 mmol, 5.00 equiv) in water (2.5 mL) with stirring. The resulting solution was stirred overnight at 50° C. in an oil bath. The pH value of the solution was adjusted to 3-4 with 1N hydrogen chloride. The resulting solid was collected by filtration and washed with water and methanol. The solid was dried in an oven. This resulted in 40 mg (25%) of (S)-3-(3-hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylic acid as a yellow solid.

Workup

  1. customInto a 50-mL round-bottom flask, was placed
  2. stirringThe resulting solution was stirred overnight at 50° C. in an oil bath
  3. filtrationThe resulting solid was collected by filtration
  4. washwashed with water and methanol
  5. customThe solid was dried in an oven
  6. customThis resulted in 40 mg (25%) of (S)-3-(3-hydroxypyrrolidin-1-yl)-2-phenylquinoxaline-6-carboxylic acid as a yellow solid

Sources & evidence

ORD record
ord-cbad676f5b01459f883d2932ef2045f5
Source dataset
uspto-grants-2015_11
Patent number
US09193693B2

Reaction notes

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