Potassium Carbonate → tert-butyl 4-(2-(1-(3-isopropyl-1,2,4-oxadiazol-5-yl)piperidin-4-yloxy)benzo[d]thiazol-6-yl)-5,6-dihydropyridine-1(2H)-carboxylate

HRID 1429567Notes

Reaction equation

HRID 1429567 reaction equation
Br[C:2]1[CH:25]=[CH:24][C:5]2[N:6]=[C:7]([O:9][CH:10]3[CH2:15][CH2:14][N:13]([C:16]4[O:20][N:19]=[C:18]([CH:21]([CH3:23])[CH3:22])[N:17]=4)[CH2:12][CH2:11]3)[S:8][C:4]=2[CH:3]=1.CC1(C)C(C)(C)OB([C:34]2[CH2:39][CH2:38][N:37]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[CH2:36][CH:35]=2)O1.C(=O)([O-])[O-].[K+].[K+]>O1CCOCC1.O.C1C=CC([P]([Pd]([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)([P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)[P](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1>[CH:21]([C:18]1[N:17]=[C:16]([N:13]2[CH2:14][CH2:15][CH:10]([O:9][C:7]3[S:8][C:4]4[CH:3]=[C:2]([C:34]5[CH2:39][CH2:38][N:37]([C:40]([O:42][C:43]([CH3:46])([CH3:45])[CH3:44])=[O:41])[CH2:36][CH:35]=5)[CH:25]=[CH:24][C:5]=4[N:6]=3)[CH2:11][CH2:12]2)[O:20][N:19]=1)([CH3:23])[CH3:22]

Participants

7

Reactant 3

HCID 11430Potassium CarbonateHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylateHCID 674667385-(4-(6-Bromobenzo[d]thiazol-2-yloxy)piperidin-1-yl)-3-isopropyl-1,2,4-oxadiazole

Product 1

HCID 67468957tert-butyl 4-(2-(1-(3-isopropyl-1,2,4-oxadiazol-5-yl)piperidin-4-yloxy)benzo[d]thiazol-6-yl)-5,6-dihydropyridine-1(2H)-carboxylateYield 28%

Reagents, catalysts & solvents 3

HCID 178418397HCID 178418397, compoundCatalystHCID 962WaterSolvent2×HCID 312751,4-DioxaneSolvent

Conditions

Temperature
100 °C

Procedure

To a degassed solution of 5-(4-(6-bromobenzo[d]thiazol-2-yloxy)piperidin-1-yl)-3-isopropyl-1,2,4-oxadiazole (697 mg, 1.646 mmol), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate (764 mg, 2.470 mmol), and potassium carbonate (683 mg, 4.94 mmol) in dioxane (12 mL) and water (4 mL) was added Pd(Ph3P)4 (114 mg, 0.099 mmol). The mixture was stirred at 100° C. under argon overnight. The mixture was cooled to rt, diluted with water (40 mL), and extracted with CH2Cl2 (3×40 mL). The combined organic layers were dried (Na2SO4), filtered, and concentrated. The crude product was purified by column chromatography (silica gel, hexanes-EtOAc gradient 0 to 50% EtOAc) to afford tert-butyl 4-(2-(1-(3-isopropyl-1,2,4-oxadiazol-5-yl)piperidin-4-yloxy)benzo[d]thiazol-6-yl)-5,6-dihydropyridine-1(2H)-carboxylate (238 mg, 0.453 mmol, 28% yield) as a yellow foam. LCMS (m/z)=526 (M+H)+.

Workup

  1. temperatureThe mixture was cooled to rt
  2. extractionextracted with CH2Cl2 (3×40 mL)
  3. dry with materialThe combined organic layers were dried (Na2SO4)
  4. filtrationfiltered
  5. concentrationconcentrated
  6. customThe crude product was purified by column chromatography (silica gel, hexanes-EtOAc gradient 0 to 50% EtOAc)

Sources & evidence

ORD record
ord-96a967b5ca6c405e922ceab75f34d521
Source dataset
uspto-grants-2015_01
Patent number
US08940716B2

Reaction notes

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