Sodium Carbonate → HCID 66958157, compound

HRID 1887717Notes

Reaction equation

HRID 1887717 reaction equation
Br[C:2]1[C:10]2[C:5](=[CH:6][CH:7]=[C:8]([N+:11]([O-:13])=[O:12])[CH:9]=2)[NH:4][N:3]=1.CC1(C)C(C)(C)OB([C:22]2[CH2:27][CH2:26][N:25]([C:28]([O:30][C:31]([CH3:34])([CH3:33])[CH3:32])=[O:29])[CH2:24][CH:23]=2)O1.C([O-])([O-])=O.[Na+].[Na+]>O1CCOCC1.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>[N+:11]([C:8]1[CH:9]=[C:10]2[C:5](=[CH:6][CH:7]=1)[NH:4][N:3]=[C:2]2[C:22]1[CH2:27][CH2:26][N:25]([C:28]([O:30][C:31]([CH3:34])([CH3:33])[CH3:32])=[O:29])[CH2:24][CH:23]=1)([O-:13])=[O:12]

Participants

6

Reactant 3

HCID 10340Sodium CarbonateHCID 4642098Tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1,2,3,6-tetrahydropyridine-1-carboxylateHCID 178526490HCID 178526490, compound

Product 1

HCID 66958157HCID 66958157, compoundYield 90%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 312751,4-DioxaneSolvent

Conditions

Temperature
120 °C

Procedure

The mixture of 3-bromo-5-nitro-1H-indazole (484.1 mg, 2.0 mmol, 1.0 eq), tert-butyl 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-5,6-dihydropyridine-1(2H)-carboxylate (927.7 mg, 1.0 eq), (PPh3)4Pd (0) (462 mg, 0.2 eq), Na2CO3 (2M, 3.0 mL, 3.0 eq) in dioxane (12 mL) was degassed and heated at 120° C. in a microwave-oven synthesizer for 2 h. The mixture was cooled to room temperature and filtered through a celite pad to remove Na2CO3 and catalyst. The celite pad was washed with EtOAc. The solvent was removed and the crude was purified by silica gel chromatography (0%˜20% MeOH/DCM) to obtain the desired product tert-butyl 4-(5-nitro-1H-indazol-3-yl)-5,6-dihydropyridine-1(2H)-carboxylate (618 mg, isolated yield 90%).

Workup

  1. customwas degassed
  2. temperatureThe mixture was cooled to room temperature
  3. filtrationfiltered through a celite pad
  4. customto remove Na2CO3 and catalyst
  5. washThe celite pad was washed with EtOAc
  6. customThe solvent was removed
  7. customthe crude was purified by silica gel chromatography (0%˜20% MeOH/DCM)

Sources & evidence

ORD record
ord-87dc815199474114b5f77ac445391580
Source dataset
uspto-grants-2013_08
Patent number
US08501763B2

Reaction notes

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