3-(1,3,2-Dioxaborinan-2-yl)pyridine → tert-butyl 4-{[4-amino-2-ethyl-7-(pyridin-3-yl)-1H-imidazo[4,5-c]quinolin-1-yl]methyl}piperidine-1-carboxylate

HRID 9442

Reaction equation

HRID 9442 reaction equation
[NH2:1][C:2]1[C:11]2[N:12]=[C:13]([CH2:29][CH3:30])[N:14]([CH2:15][CH:16]3[CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18][CH2:17]3)[C:10]=2[C:9]2[CH:8]=[CH:7][C:6](Br)=[CH:5][C:4]=2[N:3]=1.B1([C:38]2[CH:43]=[CH:42][CH:41]=[N:40][CH:39]=2)OCCCO1>O>[NH2:1][C:2]1[C:11]2[N:12]=[C:13]([CH2:29][CH3:30])[N:14]([CH2:15][CH:16]3[CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18][CH2:17]3)[C:10]=2[C:9]2[CH:8]=[CH:7][C:6]([C:38]3[CH:39]=[N:40][CH:41]=[CH:42][CH:43]=3)=[CH:5][C:4]=2[N:3]=1

Participants

4

Reactant 2

HCID 41980053-(1,3,2-Dioxaborinan-2-yl)pyridineHCID 21984269tert-Butyl 4-[(4-amino-7-bromo-2-ethyl-1H-imidazo[4,5-c]quinolin-1-yl)methyl]piperidine-1-carboxylate

Product 1

HCID 21984221tert-butyl 4-{[4-amino-2-ethyl-7-(pyridin-3-yl)-1H-imidazo[4,5-c]quinolin-1-yl]methyl}piperidine-1-carboxylateYield 59.2%

Reagents, catalysts & solvents 1

HCID 962WaterSolvent

Procedure

tert-Butyl 4-[(4-amino-7-bromo-2-ethyl-1H-imidazo[4,5-c]quinolin-1-yl)methyl]piperidine-1-carboxylate (9.24 g, 18.9 mmol) and pyridine-3-boronic acid 1,3-propanediol cyclic ester (3.39 g, 20.8 mmol) were coupled according to the method described in Examples 118–121. Additional reagents were added after the reaction was heated for 16 hours, and the reaction was continued for 16 hours. Water (20 mL) was added, and the n-propanol was removed under reduced pressure. The remaining mixture was extracted with chloroform (2×200 mL), and the combined organic fractions were purified by column chromatography on silica gel (eluting with chloroform and chloroform:CMA). The resulting solid was recrystallized from acetonitrile to provide 5.44 g of tert-butyl 4-{[4-amino-2-ethyl-7-(pyridin-3-yl)-1H-imidazo[4,5-c]quinolin-1-yl]methyl}piperidine-1-carboxylate as a white, fluffy solid, mp 229–231° C.

Workup

  1. additionAdditional reagents were added after the reaction
  2. temperaturewas heated for 16 hours
  3. customthe n-propanol was removed under reduced pressure
  4. extractionThe remaining mixture was extracted with chloroform (2×200 mL)
  5. customthe combined organic fractions were purified by column chromatography on silica gel (eluting with chloroform and chloroform:CMA)
  6. customThe resulting solid was recrystallized from acetonitrile

Sources & evidence

ORD record
ord-6ab58770b4c24ae7b57719be753f7eac
Source dataset
uspto-grants-2006_08
Patent number
US07091214B2

Linked notes

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