Triisopropyl borate → 2-(Dimethylamino)-4-methoxypyrimidin-5-ylboronic acid

HRID 2357660Notes

Reaction equation

Br[C:2]1[C:3]([O:11][CH3:12])=[N:4][C:5]([N:8]([CH3:10])[CH3:9])=[N:6][CH:7]=1.[B:13](OC(C)C)([O:18]C(C)C)[O:14]C(C)C.C([Li])CCC.[Cl-].[NH4+]>C1COCC1>[CH3:9][N:8]([CH3:10])[C:5]1[N:4]=[C:3]([O:11][CH3:12])[C:2]([B:13]([OH:18])[OH:14])=[CH:7][N:6]=1

Participants

Conditions

Temperature: -70 °C

Procedure

To a solution of 5-bromo-4-methoxy-N,N-dimethylpyrimidin-2-amine (0.300 g, 1.29 mmol) and triisopropyl borate (0.416 mL, 1.81 mmol) in 7 mL of THF at −70° C. was added butyllithium (1.6 m in hexanes, 1.13 mL, 1.81 mmol) dropwise. The reaction stirred for 30 min at −70° C. and was allowed to warm up. At −20° C. ammonium chloride (sat.) was added. The mixture was extracted with ethyl acetate (3X). The combined organic layers were dried over anhydrous sodium sulfate, filtered and concentrated to give 250 mg of crude material, which was purified by column chromatography (5% MeOH in dichloromethane) to give 157 mg of 2-(dimethylamino)-4-methoxypyrimidin-5-ylboronic acid as a white solid. ES+=198.1 (M+H).

Workup

temperatureto warm up
extractionThe mixture was extracted with ethyl acetate (3X)
dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
filtrationfiltered
concentrationconcentrated
customto give 250 mg of crude material, which
customwas purified by column chromatography (5% MeOH in dichloromethane)

Sources & evidence

ORD record: ord-0334a6bee2314bcfbb2b6d9dc9012b5c
Source dataset: uspto-grants-2010_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07759337B2

Reaction notes

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