Benzo[b]furan-2-boronic acid → Tert-butyl 2'-(2-(benzofuran-2-yl)pyrimidin-4-yl)-5'-(4-methoxybenzyl)-4'-oxo-1',4',5',6'-tetrahydrospiro[piperidine-4,7'-pyrrolo [3,2-c]pyridine]-1-carboxylate

HRID 1618953Notes

Reaction equation

HRID 1618953 reaction equation
Cl[C:2]1[N:7]=[C:6]([C:8]2[NH:16][C:15]3[C:14]4([CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18][CH2:17]4)[CH2:13][N:12]([CH2:29][C:30]4[CH:35]=[CH:34][C:33]([O:36][CH3:37])=[CH:32][CH:31]=4)[C:11](=[O:38])[C:10]=3[CH:9]=2)[CH:5]=[CH:4][N:3]=1.[O:39]1[C:43]2[CH:44]=[CH:45][CH:46]=[CH:47][C:42]=2[CH:41]=[C:40]1B(O)O>O1CCOCC1.[Pd](Cl)Cl.C1(P(C2C=CC=CC=2)[C-]2C=CC=C2)C=CC=CC=1.[C-]1(P(C2C=CC=CC=2)C2C=CC=CC=2)C=CC=C1.[Fe+2]>[O:39]1[C:43]2[CH:44]=[CH:45][CH:46]=[CH:47][C:42]=2[CH:41]=[C:40]1[C:2]1[N:7]=[C:6]([C:8]2[NH:16][C:15]3[C:14]4([CH2:21][CH2:20][N:19]([C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])[CH2:18][CH2:17]4)[CH2:13][N:12]([CH2:29][C:30]4[CH:35]=[CH:34][C:33]([O:36][CH3:37])=[CH:32][CH:31]=4)[C:11](=[O:38])[C:10]=3[CH:9]=2)[CH:5]=[CH:4][N:3]=1

Participants

5

Reactant 2

HCID 2776266Benzo[b]furan-2-boronic acidHCID 86671415HCID 86671415, compound

Product 1

HCID 68315015Tert-butyl 2'-(2-(benzofuran-2-yl)pyrimidin-4-yl)-5'-(4-methoxybenzyl)-4'-oxo-1',4',5',6'-tetrahydrospiro[piperidine-4,7'-pyrrolo [3,2-c]pyridine]-1-carboxylateYield 70%

Reagents, catalysts & solvents 2

HCID 178418228Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)CatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
140 °C

Procedure

A mixture of tert-butyl 2′-(2-chloropyrimidin-4-yl)-5′-(4-methoxybenzyl)-4′-oxo-1′,4′,5′,6′-tetrahydrospiro[piperidine-4,7′-pyrrolo[3,2-c]pyridine]-1-carboxylate (A5) (4.5 g, 8.36 mmol), 2-benzofuranboronic acid (4.06 g, 25.09 mmol) and potassium phosphate tribasic heptahydrate (8.49 g, 25.09 mmol) was dissolved in anhydrous dioxane (105 mL). The resulting solution was purged with nitrogen, followed by addition of 1,1′-bis(diphenylphosphino)ferrocene palladium(II)chloride (676 mg, 0.836 mmol). The resulting mixture was again purged with nitrogen and stirred at 140° C. for 45 min in the microwave. After cooling to room temperature, the reaction mixture was diluted with EtOAc, washed three times with aqueous NaHCO3, once with brine, dried over Na2SO4, filtered and concentrated under vacuum. The crude product was triturated with toluene which gave tert-butyl 2′-(2-(benzofuran-2-yl)pyrimidin-4-yl)-5′-(4-methoxybenzyl)-4′-oxo-1′,4′,5′,6′-tetrahydro spiro [piperidine-4,7′-pyrrolo[3,2-c]pyridine]-1-carboxylate (A6) as a white solid (3.60 g, 70%). 1H NMR (400 MHz, DMSO-D6, 300K): δ=1.42 (9H, s), 1.55 (2H, br d, J=13.0 Hz), 2.08 (2H, br dt, J=13.4 Hz), 2.65 (2H, br s), 3.56 (2H, br s), 3.74 (3H, s), 3.80 (2H, br s), 4.57 (2H, br s), 6.92 (2H, d, J=8.6 Hz), 7.31 (2H, d, J=8.6 Hz), 7.35 (1H, t, J=7.6 Hz), 7.43 (1H, s), 7.46 (1H, t, J=7.8 Hz), 7.75 (1H, d, J=8.2 Hz), 7.80 (1H, d, J=5.5 Hz), 7.82 (1H, d, J=7.7 Hz), 8.03 (1H, s), 8.77 (1H, d, J=5.4 Hz), 11.75 (1H, s). MS (ES) C36H37N5O5 requires: 619. found: 620.2 [M+H]+.

Workup

  1. customThe resulting solution was purged with nitrogen
  2. customThe resulting mixture was again purged with nitrogen
  3. temperatureAfter cooling to room temperature
  4. additionthe reaction mixture was diluted with EtOAc
  5. washwashed three times with aqueous NaHCO3
  6. dry with materialonce with brine, dried over Na2SO4
  7. filtrationfiltered
  8. concentrationconcentrated under vacuum
  9. customThe crude product was triturated with toluene which

Sources & evidence

ORD record
ord-3e507b860e5f4969aade7f286b64d40a
Source dataset
uspto-grants-2014_07
Patent number
US08772286B2

Reaction notes

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