Triethylamine → (2R,5R)-5-Chloromethyl-4-{2-[6-(2,4-difluoro-benzyl)-3,3-dimethyl-2,3-dihydro-pyrrolo[3,2-c]pyridin-1-yl]-2-oxo-ethyl}-2-methyl-piperazine-1-carboxylic acid tert-butyl ester

HRID 1475486Notes

Reaction equation

HRID 1475486 reaction equation
CS([Cl:5])(=O)=O.[C:6]([O:10][C:11]([N:13]1[CH2:18][C@H:17]([CH2:19]O)[N:16]([CH2:21][C:22]([N:24]2[C:32]3[CH:31]=[C:30]([CH2:33][C:34]4[CH:39]=[CH:38][C:37]([F:40])=[CH:36][C:35]=4[F:41])[N:29]=[CH:28][C:27]=3[C:26]([CH3:43])([CH3:42])[CH2:25]2)=[O:23])[CH2:15][C@H:14]1[CH3:44])=[O:12])([CH3:9])([CH3:8])[CH3:7].C(N(CC)CC)C>C(Cl)Cl>[C:6]([O:10][C:11]([N:13]1[CH2:18][C@H:17]([CH2:19][Cl:5])[N:16]([CH2:21][C:22]([N:24]2[C:32]3[CH:31]=[C:30]([CH2:33][C:34]4[CH:39]=[CH:38][C:37]([F:40])=[CH:36][C:35]=4[F:41])[N:29]=[CH:28][C:27]=3[C:26]([CH3:43])([CH3:42])[CH2:25]2)=[O:23])[CH2:15][C@H:14]1[CH3:44])=[O:12])([CH3:9])([CH3:8])[CH3:7]

Participants

5

Reactant 3

HCID 8471TriethylamineHCID 31297Methanesulfonyl chlorideHCID 86724032(2R,5R)-4-{2-[6-(2,4-difluoro-benzyl)-3,3-dimethyl-2,3-dihydro-pyrrolo[3,2-c]pyridin-1-yl]-2-oxo-ethyl}-5-hydroxymethyl-2-methyl-piperazine-1-carboxylic acid tert-butyl ester

Product 1

HCID 86724033(2R,5R)-5-Chloromethyl-4-{2-[6-(2,4-difluoro-benzyl)-3,3-dimethyl-2,3-dihydro-pyrrolo[3,2-c]pyridin-1-yl]-2-oxo-ethyl}-2-methyl-piperazine-1-carboxylic acid tert-butyl esterYield 88.8%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Procedure

Chloroacetyl chloride (0.995 mL, 12.0 mmol) was added dropwise to a stirred solution of 6-(2,4-difluoro-benzyl)-3,3-dimethyl-2,3-dihydro-1H-pyrrolo[3,2-c]pyridine hydrochloride (3.10 g, 10.0 mmol) and triethylamine (4.6 mL, 33.0 mmol) in anhydrous DCM (50 mL) and the mixture was stirred at room temperature for 16 hours. (2R,5R)-5-Hydroxymethyl-2-methyl-piperazine-1-carboxylic acid tert-butyl ester (2.76 g, 12.0 mmol) was added and the mixture was stirred at room temperature for a further 16 hours. Further triethylamine (1 mL) and (2R,5R)-5-hydroxymethyl-2-methyl-piperazine-1-carboxylic acid tert-butyl ester (700 mg) were added and the mixture stirred for a further 16 hours. The mixture was diluted with DCM, washed with water, the organic layer separated and the solvent removed in vacuo. Chromatography (silica, elution with 30-100% ethyl acetate in petroleum ether) afforded (2R,5R)-4-{2-[6-(2,4-difluoro-benzyl)-3,3-dimethyl-2,3-dihydro-pyrrolo[3,2-c]pyridin-1-yl]-2-oxo-ethyl}-5-hydroxymethyl-2-methyl-piperazine-1-carboxylic acid tert-butyl ester (4.36 g, 80%) as a pale tan foam. MS: [M+H]+ 545. Methanesulfonyl chloride (0.78 mL, 10.0 mmol) was added dropwise to a stirred solution of (2R,5R)-4-{2-[6-(2,4-difluoro-benzyl)-3,3-dimethyl-2,3-dihydro-pyrrolo[3,2-c]pyridin-1-yl]-2-oxo-ethyl}-5-hydroxymethyl-2-methyl-piperazine-1-carboxylic acid tert-butyl ester (4.36 g, 8.0 mmol) and triethylamine (1.67 mL, 12.0 mmol) in anhydrous DCM (40 mL) and the mixture was stirred at room temperature for 16 hours. The mixture was diluted with DCM, washed successively with saturated aqueous sodium hydrogen carbonate and then water. The organic layer was separated and the solvent removed in vacuo to afford the title compound (4.0 g, 71%) as a pale yellow foam. MS: [M+H]+=563, 565.

Workup

  1. washwashed successively with saturated aqueous sodium hydrogen carbonate
  2. customThe organic layer was separated
  3. customthe solvent removed in vacuo

Sources & evidence

ORD record
ord-5727ea4809b5495b9929e4749a1570c8
Source dataset
uspto-grants-2015_04
Patent number
US09018214B2

Reaction notes

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