1,2-Dimethoxyethane → 2-{5-[4-(5-Bromo-thiophen-2-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl ester

HRID 79685

Reaction equation

HRID 79685 reaction equation
[Br:1][C:2]1[S:3][C:4](Br)=[CH:5][CH:6]=1.[C:8]([O:12][C:13]([N:15]1[CH2:19][CH2:18][CH2:17][CH:16]1[C:20]1[NH:21][C:22]([C:25]2[CH:30]=[CH:29][C:28](B3OC(C)(C)C(C)(C)O3)=[CH:27][CH:26]=2)=[CH:23][N:24]=1)=[O:14])([CH3:11])([CH3:10])[CH3:9].C(COC)OC>C([O-])([O-])=O.[K+].[K+].C(OCC)(=O)C.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[C:8]([O:12][C:13]([N:15]1[CH2:19][CH2:18][CH2:17][CH:16]1[C:20]1[NH:21][C:22]([C:25]2[CH:30]=[CH:29][C:28]([C:4]3[S:3][C:2]([Br:1])=[CH:6][CH:5]=3)=[CH:27][CH:26]=2)=[CH:23][N:24]=1)=[O:14])([CH3:11])([CH3:9])[CH3:10]

Participants

7

Reactant 3

HCID 80711,2-DimethoxyethaneHCID 184532,5-DibromothiopheneHCID 574497592-{4-[4-(4,4,5,5-Tetramethyl[1,3,2]dioxaborolan-2-yl)phenyl]-1h-imidazol-2-yl}pyrrolidine-1-carboxylic acid tert-butyl ester

Product 1

HCID 666202532-{5-[4-(5-Bromo-thiophen-2-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl esterYield 98.7%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 8857Ethyl AcetateSolventHCID 11430Potassium CarbonateSolvent

Conditions

Temperature
90 °C

Procedure

A mixture of 2,5-Dibromo-thiophene (4.93 g), 2-{5-[4-(4,4,5,5-Tetramethyl-[1,3,2]dioxaborolan-2-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl ester (0.896 g, prepared according to WO2008021927 A2), and Pd(PPh3)4 (0.118 g) in 2M K2CO3 (3.06 mL)/dimethoxyethane (6.12 mL) was heated at 90° C. for 8 hours. Reaction mixture was cooled, diluted with ethyl acetate and washed with brine, dried (MgSO4), concentrated and purified by flash column chromatography (silica gel, 0 to 100% ethyl acetate/hexanes) to give 2-{5-[4-(5-Bromo-thiophen-2-yl)-phenyl]-1H-imidazol-2-yl}-pyrrolidine-1-carboxylic acid tert-butyl ester (0.955 g): LCMS-ESI+: calc'd for C22H25BrN3O2S: 475.42 (M+H+). Found: 473.8, 475.9 (M+H+).

Workup

  1. customReaction mixture
  2. temperaturewas cooled
  3. washwashed with brine
  4. dry with materialdried (MgSO4)
  5. concentrationconcentrated
  6. custompurified by flash column chromatography (silica gel, 0 to 100% ethyl acetate/hexanes)

Sources & evidence

ORD record
ord-5d189c3468ed4e24aae95a407718e28d
Source dataset
uspto-grants-2014_09
Patent number
US08841278B2

Linked notes

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