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Cesium carbonate → (S)-tert-Butyl (1-(6-(3,6-dihydro-2H-pyran-4-yl)-1-methyl-1H-pyrrolo[3,2-b]pyridin-5-yl)ethyl)carbamate

HRID 75303
Notes
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Reaction equation

HRID 75303 reaction equation
Br[C:2]1[CH:3]=[C:4]2[N:20]([CH3:21])[CH:19]=[CH:18][C:5]2=[N:6][C:7]=1[C@@H:8]([NH:10][C:11](=[O:17])[O:12][C:13]([CH3:16])([CH3:15])[CH3:14])[CH3:9].[O:22]1[CH2:27][CH:26]=[C:25](B2OC(C)(C)C(C)(C)O2)[CH2:24][CH2:23]1.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.O.CCOC(C)=O.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.C1C=CC(P(C2C=CC=CC=2)[C-]2C=CC=C2)=CC=1.Cl[Pd]Cl.[Fe+2]>[O:22]1[CH2:23][CH:24]=[C:25]([C:2]2[CH:3]=[C:4]3[N:20]([CH3:21])[CH:19]=[CH:18][C:5]3=[N:6][C:7]=2[C@@H:8]([NH:10][C:11](=[O:17])[O:12][C:13]([CH3:16])([CH3:15])[CH3:14])[CH3:9])[CH2:26][CH2:27]1
ParticipantsConditionsProcedureWorkupSources & evidenceReaction notes

Participants

8

Reactant 3

HCID 10796Cesium carbonateHCID 112180533,6-Dihydro-2H-pyran-4-boronic acid pinacol esterHCID 86707985(S)-tert-butyl (1-(6-bromo-1-methyl-1H-pyrrolo[3,2-b]pyridin-5-yl)ethyl)carbamate

Product 1

HCID 86708002(S)-tert-Butyl (1-(6-(3,6-dihydro-2H-pyran-4-yl)-1-methyl-1H-pyrrolo[3,2-b]pyridin-5-yl)ethyl)carbamate

Reagents, catalysts & solvents 4

HCID 44119782
Bis(cyclopenta-1,4-dien-1-yl(diphenyl)phosphane);dichloropalladium;iron(2+)
Catalyst
HCID 962WaterSolvent
HCID 8857Ethyl AcetateSolvent
HCID 312751,4-DioxaneSolvent

Conditions

Temperature
90 °C

Procedure

To a 20 mL microwave vial were added (S)-tert-butyl (1-(6-bromo-1-methyl-1H-pyrrolo[3,2-b]pyridin-5-yl)ethyl)carbamate (1 g, 2.8 mmol), 2-(3,6-dihydro-2H-pyran-4-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (0.890 g, 4.23 mmol), PdCl2(dppf) (0.207 g, 0.282 mmol) and cesium carbonate (1.84 g, 5.65 mmol) in dioxane (12 mL) and water (2 mL). The resulting brown suspension was heated in a microwave reactor at 90° C. on high absorbance for 1 hour. The reaction mixture was diluted with EtOAc and washed with saturated aqueous NH4Cl (3×). The combined organic layers were dried over MgSO4, filtered, and concentrated. The product was purified using silica gel column chromatography (12 g, 2:8 to 8:2 EtOAc/hexane) to give the title compound as a yellow oil. 1H NMR (400 MHz, DMSO-d6) δ ppm 0.99-1.13 (m, 9 H), 1.25-1.38 (m, 12 H), 3.74-3.97 (m, 7 H), 4.16-4.26 (m, 2H), 4.90-5.05 (m, 1 H), 5.68-5.77 (m, 1 H), 6.47-6.55 (m, 1 H), 6.76-6.87 (m, 1 H), 7.59 (s, 2 H); ESI-MS m/z [M+H]+ calc'd for C20H27N3O3, 358; found 358.

Workup

  1. washwashed with saturated aqueous NH4Cl (3×)
  2. dry with materialThe combined organic layers were dried over MgSO4
  3. filtrationfiltered
  4. concentrationconcentrated
  5. customThe product was purified

Sources & evidence

ORD record
ord-9a3dc4d763594c358330656fed049f74
Source dataset
uspto-grants-2014_09
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08835420B2

Reaction notes

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