Cesium carbonate → (S)-methyl 6-(2-(1-(tert-butoxycarbonyl)-4-hydroxypiperidin-4-yl)thiazol-4-yl)-5-cyclobutoxy-2-methyl-3,4-dihydroquinoline-1(2H)-carboxylate

HRID 1051647Notes

Reaction equation

HRID 1051647 reaction equation
[CH:1]1([O:5][C:6]2[C:15](B3OC(C)(C)C(C)(C)O3)=[CH:14][CH:13]=[C:12]3[C:7]=2[CH2:8][CH2:9][C@H:10]([CH3:29])[N:11]3[C:25]([O:27][CH3:28])=[O:26])[CH2:4][CH2:3][CH2:2]1.Br[C:31]1[N:32]=[C:33]([C:36]2([OH:49])[CH2:41][CH2:40][N:39]([C:42]([O:44][C:45]([CH3:48])([CH3:47])[CH3:46])=[O:43])[CH2:38][CH2:37]2)[S:34][CH:35]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>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+].O1CCOCC1.O>[C:45]([O:44][C:42]([N:39]1[CH2:38][CH2:37][C:36]([C:33]2[S:34][CH:35]=[C:31]([C:15]3[C:6]([O:5][CH:1]4[CH2:2][CH2:3][CH2:4]4)=[C:7]4[C:12](=[CH:13][CH:14]=3)[N:11]([C:25]([O:27][CH3:28])=[O:26])[C@@H:10]([CH3:29])[CH2:9][CH2:8]4)[N:32]=2)([OH:49])[CH2:41][CH2:40]1)=[O:43])([CH3:48])([CH3:46])[CH3:47]

Participants

7

Reactant 3

HCID 10796Cesium carbonateHCID 66749307Tert-butyl 4-(4-bromo-1,3-thiazol-2-yl)-4-hydroxypiperidine-1-carboxylateHCID 123985314(S)-methyl 5-cyclobutoxy-2-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydroquinoline-1(2H)-carboxylate

Product 1

HCID 118075548(S)-methyl 6-(2-(1-(tert-butoxycarbonyl)-4-hydroxypiperidin-4-yl)thiazol-4-yl)-5-cyclobutoxy-2-methyl-3,4-dihydroquinoline-1(2H)-carboxylateYield 93%

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 5-cyclobutoxy-2-methyl-6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,4-dihydroquinoline-1(2H)-carboxylate (0.109 g, 0.273 mmol), tert-butyl 4-(4-bromothiazol-2-yl)-4-hydroxypiperidine-1-carboxylate (0.090 g, 0.248 mmol), XPhos Precatalyst 2nd Generation (0.019 g, 0.025 mmol), and cesium carbonate (0.242 g, 0.743 mmol) in 1,4-dioxane (1.0 mL) and water (0.2 mL) was heated at 100° C. for 2.5 h. The reaction mixture was cooled to room temperature, filtered through a pad of Celite, and concentrated. The residue was purified via column chromatography on silica gel (Biotage 25 g column, gradient elution with 5-50% ethyl acetate-hexane) to afford (S)-methyl 6-(2-(1-(tert-butoxycarbonyl)-4-hydroxypiperidin-4-yl)thiazol-4-yl)-5-cyclobutoxy-2-methyl-3,4-dihydroquinoline-1(2H)-carboxylate (0.128 g, 93%). MS (ESI, pos. ion) m/z 558 [M+H]+.

Workup

  1. temperatureThe reaction mixture was cooled to room temperature
  2. filtrationfiltered through a pad of Celite
  3. concentrationconcentrated
  4. customThe residue was purified via column chromatography on silica gel (Biotage 25 g column, gradient elution with 5-50% ethyl acetate-hexane)

Sources & evidence

ORD record
ord-dd0d052637c44eeaa5680f336eba22b0
Source dataset
uspto-grants-2016_07
Patent number
US09388161B2

Reaction notes

Loading…