Cesium carbonate → (S)-methyl 6-(1-(1-(tert-butoxycarbonyl)piperidin-4-yl)-1H-pyrazol-4-yl)-2-methyl-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate

HRID 1051608Notes

Reaction equation

HRID 1051608 reaction equation
Br[C:2]1[C:3]([O:17][CH2:18][CH2:19][CH3:20])=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]([C:12]([O:14][CH3:15])=[O:13])[C@@H:7]([CH3:16])[CH2:6][CH2:5]2.CC1(C)C(C)(C)OB([C:29]2[CH:30]=[N:31][N:32]([CH:34]3[CH2:39][CH2:38][N:37]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[CH2:36][CH2:35]3)[CH:33]=2)O1.C(=O)([O-])[O-].[Cs+].[Cs+]>O1CCOCC1.O.CC(C1C=C(C(C)C)C(C2C=CC=C(P(C3CCCCC3)C3CCCCC3)C=2)=C(C(C)C)C=1)C.C1C=[C-]C(C2C(N)=CC=CC=2)=CC=1.Cl[Pd+]>[C:43]([O:42][C:40]([N:37]1[CH2:36][CH2:35][CH:34]([N:32]2[CH:33]=[C:29]([C:2]3[C:3]([O:17][CH2:18][CH2:19][CH3:20])=[C:4]4[C:9](=[CH:10][CH:11]=3)[N:8]([C:12]([O:14][CH3:15])=[O:13])[C@@H:7]([CH3:16])[CH2:6][CH2:5]4)[CH:30]=[N:31]2)[CH2:39][CH2:38]1)=[O:41])([CH3:46])([CH3:44])[CH3:45]

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 45480279tert-butyl 4-[4-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl]piperidine-1-carboxylateHCID 118076394(S)-methyl 6-bromo-2-methyl-5-propoxy-3,4-dihydroquinoline-1 (2H)-carboxylate

Product 1

HCID 118075606(S)-methyl 6-(1-(1-(tert-butoxycarbonyl)piperidin-4-yl)-1H-pyrazol-4-yl)-2-methyl-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylateYield 100.3%

Reagents, catalysts & solvents 3

HCID 72376365[2-(2-Aminophenyl)phenyl]-chloro-palladium dicyclohexyl-[3-(2,4,6-triisopropylphenyl)phenyl]phosphaneCatalystHCID 962WaterSolventHCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

A mixture of (S)-methyl 6-bromo-2-methyl-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate (0.060 g, 0.175 mmol), tert-butyl 4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylate (0.066 g, 0.175 mmol), chloro(2-dicyclohexylphosphino-2′,4′,6′-tri-i-propyl-1,1′-biphenyl)(2′-amino-1,1′-biphenyl-2-yl) palladium(II) (XPhos 2nd generation precatalyst) (0.014 g, 0.018 mmol), and cesium carbonate (0.171 g, 0.526 mmol) in 1,4-dioxane (2.0 mL) and water (0.40 mL) was heated in the microwave at 100° C. for 5 h. The reaction mixture was filtered through Celite and concentrated to afford an orange oil. This material was purified via column chromatography on silica gel (Biotage 25 g column, gradient elution with 0-50% ethyl acetate-hexane) to afford (S)-methyl 6-(1-(1-(tert-butoxycarbonyl)piperidin-4-yl)-1H-pyrazol-4-yl)-2-methyl-5-propoxy-3,4-dihydroquinoline-1(2H)-carboxylate (0.090 g, 100%) as a colorless oil. MS (ESI, pos. ion) m/z 513 [M+H]+.

Workup

  1. filtrationThe reaction mixture was filtered through Celite
  2. concentrationconcentrated
  3. customto afford an orange oil
  4. customThis material was purified via column chromatography on silica gel (Biotage 25 g column, gradient elution with 0-50% ethyl acetate-hexane)

Sources & evidence

ORD record
ord-19f6a23f4a974769a34f7677a8c2ca71
Source dataset
uspto-grants-2016_07
Patent number
US09388161B2

Reaction notes

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