Cesium carbonate → (5)-tert-butyl 4-(4-(1-acetyl-2-methyl-5-propoxy-1,2,3,4-tetrahydroquinolin-6-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylate

HRID 1051604Notes

Reaction equation

HRID 1051604 reaction equation
Br[C:2]1[C:3]([O:16][CH2:17][CH2:18][CH3:19])=[C:4]2[C:9](=[CH:10][CH:11]=1)[N:8]([C:12](=[O:14])[CH3:13])[C@@H:7]([CH3:15])[CH2:6][CH2:5]2.CC1(C)C(C)(C)OB([C:28]2[CH:29]=[N:30][N:31]([CH:33]3[CH2:38][CH2:37][N:36]([C:39]([O:41][C:42]([CH3:45])([CH3:44])[CH3:43])=[O:40])[CH2:35][CH2:34]3)[CH:32]=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:12]([N:8]1[C:9]2[C:4](=[C:3]([O:16][CH2:17][CH2:18][CH3:19])[C:2]([C:28]3[CH:29]=[N:30][N:31]([CH:33]4[CH2:34][CH2:35][N:36]([C:39]([O:41][C:42]([CH3:45])([CH3:44])[CH3:43])=[O:40])[CH2:37][CH2:38]4)[CH:32]=3)=[CH:11][CH:10]=2)[CH2:5][CH2:6][C@@H:7]1[CH3:15])(=[O:14])[CH3:13]

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 118086263(S)-1-(6-bromo-2-methyl-5-propoxy-3,4-dihydroquinolin-1(2H)-yl)ethanone

Product 1

HCID 118076049(5)-tert-butyl 4-(4-(1-acetyl-2-methyl-5-propoxy-1,2,3,4-tetrahydroquinolin-6-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylateYield 83%

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)-1-(6-bromo-2-methyl-5-propoxy-3,4-dihydroquinolin-1(2H)-yl)ethanone (0.050 g, 0.153 mmol), tert-butyl 4-(4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylate (0.058 g, 0.153 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) (0.012 g, 0.015 mmol), and cesium carbonate (0.150 g, 0.460 mmol) in 1,4-dioxane (2.0 mL) and water (0.40 mL) was heated in the microwave at 100° C. for 2.5 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 50-100% ethyl acetate-hexane) to afford (5)-tert-butyl 4-(4-(1-acetyl-2-methyl-5-propoxy-1,2,3,4-tetrahydroquinolin-6-yl)-1H-pyrazol-1-yl)piperidine-1-carboxylate (0.063 g, 83%) as an off-white solid. MS (ESI, pos. ion) m/z 497 [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 50-100% ethyl acetate-hexane)

Sources & evidence

ORD record
ord-ae080129998646b98247170e8bc739e9
Source dataset
uspto-grants-2016_07
Patent number
US09388161B2

Reaction notes

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