Cesium carbonate → tert-butyl 4-(1-(4-methoxybenzyl)-5-phenyl-1H-pyrazolo[3,4-b]pyridin-4-yl)piperazine-1-carboxylate

HRID 387557Notes

Reaction equation

HRID 387557 reaction equation
Br[C:2]1[C:3]([N:20]2[CH2:25][CH2:24][N:23]([C:26]([O:28][C:29]([CH3:32])([CH3:31])[CH3:30])=[O:27])[CH2:22][CH2:21]2)=[C:4]2[CH:10]=[N:9][N:8]([CH2:11][C:12]3[CH:17]=[CH:16][C:15]([O:18][CH3:19])=[CH:14][CH:13]=3)[C:5]2=[N:6][CH:7]=1.[C:33]1(B(O)O)[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1.C([O-])([O-])=O.[Cs+].[Cs+]>O1CCOCC1.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.O.CCOCC>[CH3:19][O:18][C:15]1[CH:14]=[CH:13][C:12]([CH2:11][N:8]2[C:5]3=[N:6][CH:7]=[C:2]([C:33]4[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=4)[C:3]([N:20]4[CH2:21][CH2:22][N:23]([C:26]([O:28][C:29]([CH3:31])([CH3:30])[CH3:32])=[O:27])[CH2:24][CH2:25]4)=[C:4]3[CH:10]=[N:9]2)=[CH:17][CH:16]=1

Participants

8

Reactant 3

HCID 10796Cesium carbonateHCID 66827Phenylboronic AcidHCID 68760849tert-butyl 4-(5-bromo-1-(4-methoxybenzyl)-1H-pyrazolo[3,4-b]pyridin-4-yl)piperazine-1-carboxylate

Product 1

HCID 68764155tert-butyl 4-(1-(4-methoxybenzyl)-5-phenyl-1H-pyrazolo[3,4-b]pyridin-4-yl)piperazine-1-carboxylateYield 89%

Reagents, catalysts & solvents 4

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent2×HCID 3283Diethyl EtherSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
80 °C

Procedure

tert-Butyl 4-(5-bromo-1-(4-methoxybenzyl)-1H-pyrazolo[3,4-b]pyridin-4-yl)piperazine-1-carboxylate (0.50 g, 0.995 mmol), phenylboronic acid (0.182 g, 1.49 mmol), Pd(PPh3)4 (0.115 g, 0.0995 mmol) and Cs2CO3 (1.30 g, 3.98 mmol) were placed in dioxane:H2O (8 mL, 3:1). The solution was heated to 80° C. for 6 hours. Ether (50 mL) and H2O (20 mL) were then added. The organic layer was separated, washed with brine, dried over sodium sulfate, filtered and concentrated. The resulting residue was purified by column chromatography (DCM:ethyl acetate=5:1) to give tert-butyl 4-(1-(4-methoxybenzyl)-5-phenyl-1H-pyrazolo[3,4-b]pyridin-4-yl)piperazine-1-carboxylate (0.442 g, 89%) as a foam solid. MS ESI (+) m/z 500.4 detected. 1H NMR (400 Hz, DMSO-d6) δ 8.26 (s, 1H), 8.10 (s, 1H), 7.51 (m, 2H), 7.44 (m, 2H), 7.32 (m, 1H), 7.20 (d, J=8.4 Hz, 2H), 6.83 (d, J=8.4 Hz, 2H), 5.50 (s, 2H), 3.67 (s, 3H), 3.23 (m, 4H), 3.20 (m, 4H).

Workup

  1. customThe organic layer was separated
  2. washwashed with brine
  3. dry with materialdried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe resulting residue was purified by column chromatography (DCM:ethyl acetate=5:1)

Sources & evidence

ORD record
ord-4279ab9a99914cc69a893358804e84e4
Source dataset
uspto-grants-2013_02
Patent number
US08372842B2

Reaction notes

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