Hydrochloric Acid → (2S,3S)-toluene-4 sulfonic acid 3-(5-fluoro-3-methyl-indol-1-yl)-2-hydroxy-3-phenyl-propyl ester

HRID 1869260Notes

Reaction equation

HRID 1869260 reaction equation
[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([C@@H:11]([C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[C@H:12]([OH:15])[CH2:13][OH:14])[CH:6]=[C:5]2[CH3:22].[C:23]1([CH3:33])[CH:28]=[CH:27][C:26]([S:29](Cl)(=[O:31])=[O:30])=[CH:25][CH:24]=1.Cl>N1C=CC=CC=1>[F:1][C:2]1[CH:3]=[C:4]2[C:8](=[CH:9][CH:10]=1)[N:7]([C@@H:11]([C:16]1[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=1)[C@H:12]([OH:15])[CH2:13][O:14][S:29]([C:26]1[CH:27]=[CH:28][C:23]([CH3:33])=[CH:24][CH:25]=1)(=[O:31])=[O:30])[CH:6]=[C:5]2[CH3:22]

Participants

5

Reactant 3

HCID 313Hydrochloric AcidHCID 73974-Toluenesulfonyl chlorideHCID 68904417HCID 68904417, compound

Product 1

HCID 87617828(2S,3S)-toluene-4 sulfonic acid 3-(5-fluoro-3-methyl-indol-1-yl)-2-hydroxy-3-phenyl-propyl ester

Reagents, catalysts & solvents 1

HCID 1049PyridineSolvent

Procedure

A solution of (2S,3S)-3-(5-fluoro-3-methyl-1H-indol-1-yl)-3-phenylpropane-1,2-diol (1.03 g, 3.4 mmol) and p-toluenesulfonyl chloride (0.78 g, 4.1 mmol) in anhydrous pyridine (11 ml) was stirred at room temperature under nitrogen for 12 hours. The reaction was poured into a 1N aqueous solution of hydrochloric acid (50 mL) and extracted with ethyl acetate (50 mL). The organics were dried over anhydrous sodium sulfate, filtered, and concentrated to give (2S,3S)-toluene-4-sulfonic acid 3-(5-fluoro-3-methyl-indol-1-yl)-2-hydroxy-3-phenyl-propyl ester. The product was used in the next step without further purification. To a solution of toluene-4-sulfonic acid 3-(5-fluoro-3-methyl-indol-1-yl)-2-hydroxy-3-phenyl-propyl ester (1.6 g, 3.4 mmol) in methanol (10 mL) was added a 2N solution of methylamine in methanol (8.6 mL, 17 mmol) and the reaction stirred for 12 hours. Upon completion, the reaction was partitioned between saturated sodium bicarbonate (50 mL) and ethyl acetate (50 mL). The organic layer was separated, dried over anhydrous sodium sulfate, filtered, and concentrated in vacuo. The crude product was purified via Biotage chromatography (FlasH40i, silica, 20% MeOH/dichloromethane) to give (1S,2R)-1-(5-fluoro-3-methyl-1H-indol-1-yl)-3-(methylamino)-1-phenylpropan-2-ol as a clear oil. The free base was dissolved in a minimum amount of ethanol and treated with a 2N ethereal solution of hydrochloric acid and stirred for 1 hour. The ethanol was removed in vacuo and the clear oil was triturated with ether/dichloromethane to give (1S,2R)-1-(5-fluoro-3-methyl-1H-indol-1-yl)-3-(methylamino)-1-phenylpropan-2-ol hydrochloride as a white solid. MS (ESI) m/z 313

Workup

  1. extractionextracted with ethyl acetate (50 mL)
  2. dry with materialThe organics were dried over anhydrous sodium sulfate
  3. filtrationfiltered
  4. concentrationconcentrated

Sources & evidence

ORD record
ord-6ffc28474fab4c6ab042e2602f586b2e
Source dataset
uspto-grants-2009_12
Patent number
US07638512B2

Reaction notes

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