Water → 4-(5-(Bis(tert-butoxycarbonyl)amino)-6-(3-phenylisoxazol-5-yl)pyrazin-2-yl)benzoic acid

HRID 78602Notes

Reaction equation

HRID 78602 reaction equation
Br[C:2]1[N:3]=[C:4]([C:23]2[O:27][N:26]=[C:25]([C:28]3[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=3)[CH:24]=2)[C:5]([N:8]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C:9](=[O:15])[O:10][C:11]([CH3:14])([CH3:13])[CH3:12])=[N:6][CH:7]=1.B([C:37]1[CH:45]=[CH:44][C:40]([C:41]([OH:43])=[O:42])=[CH:39][CH:38]=1)(O)O.C([O-])([O-])=O.[Na+].[Na+].O>CC#N.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>[C:11]([O:10][C:9]([N:8]([C:16]([O:18][C:19]([CH3:22])([CH3:21])[CH3:20])=[O:17])[C:5]1[N:6]=[CH:7][C:2]([C:37]2[CH:45]=[CH:44][C:40]([C:41]([OH:43])=[O:42])=[CH:39][CH:38]=2)=[N:3][C:4]=1[C:23]1[O:27][N:26]=[C:25]([C:28]2[CH:33]=[CH:32][CH:31]=[CH:30][CH:29]=2)[CH:24]=1)=[O:15])([CH3:14])([CH3:13])[CH3:12]

Participants

7

Reactant 4

HCID 962WaterHCID 10340Sodium CarbonateHCID 3121834-Carboxyphenylboronic AcidHCID 59472363tert-butyl (5-bromo-3-(3-phenylisoxazol-5-yl)pyrazin-2-yl)-N-tert-butoxycarbonyl-carbamate

Product 1

HCID 594724114-(5-(Bis(tert-butoxycarbonyl)amino)-6-(3-phenylisoxazol-5-yl)pyrazin-2-yl)benzoic acidYield 99%

Reagents, catalysts & solvents 2

HCID 178418397HCID 178418397, compoundCatalystHCID 6342AcetonitrileSolvent

Conditions

Temperature
110 °C

Procedure

Tert-butyl N-[5-bromo-3-(3-phenylisoxazol-5-yl)pyrazin-2-yl]-N-tert-butoxycarbonyl-carbamate (184 mg, 0.3379 mmol), 4-boronobenzoic acid (56.07 mg, 0.3379 mmol) and Na2CO3 (71.63 mg, 0.6758 mmol) were suspended in MeCN (2.896 mL)/water (2.896 mL) and the mixture de-gassed (×5) and treated with Pd(PPh3)4 (39.05 mg, 0.03379 mmol). The reaction was de-gassed again and heated at 110° C. in the microwave for 30 minutes. The reaction mixture was concentrated to half its original volume and washed with DCM. The aqueous phase was acidified to pH4 by (2M HCl) and resulting precipitate collected, washed with water and dried under vacuum (120 mg, 99% Yield). MS (ES+) 359.12

Workup

  1. customthe mixture de-gassed (×5)
  2. customThe reaction was de-gassed again
  3. concentrationThe reaction mixture was concentrated to half its original volume
  4. washwashed with DCM
  5. customresulting precipitate
  6. customcollected
  7. washwashed with water
  8. customdried under vacuum (120 mg, 99% Yield)

Sources & evidence

ORD record
ord-4d88796b4f8d4433a60480a4df11c97a
Source dataset
uspto-grants-2014_09
Patent number
US08841308B2

Reaction notes

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