Sodium Carbonate → 2-Acetyl-6-phenylpyridine

HRID 433856Notes

Reaction equation

[C:1]([C:4]1[CH:9]=[CH:8][CH:7]=[C:6](Br)[N:5]=1)(=[O:3])[CH3:2].[C:11]1(B(O)O)[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=1.C([O-])([O-])=O.[Na+].[Na+]>C1(C)C=CC=CC=1.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:1]([C:4]1[CH:9]=[CH:8][CH:7]=[C:6]([C:11]2[CH:16]=[CH:15][CH:14]=[CH:13][CH:12]=2)[N:5]=1)(=[O:3])[CH3:2]

Participants

Conditions

Temperature: 80 °C

Procedure

To a Schlenk tube charged with a solution of 200 mg (1.0 mmol) of 2-acetyl-6-bromopyridine and 23 mg (0.02 mmol) of (Ph3P)4Pd in 10 mL of degassed toluene was added a solution of 150 mg (1.2 mmol) phenylboronic acid and 270 mg (2.5 mmol) Na2CO3 in 8 mL of degassed 4:1 H2O/MeOH. The biphasic mixture was heated to 80° C. with rapid stirring for 1 h. On cooling to RT, Et2O (50 mL) was added and the layers were separated. The organic layer was dried over Na2SO4 and the volatiles were removed by rotary evaporation. The resulting oil was chromatographed on silica with 10-50% CH2Cl2/hexanes eluent to provide 176 mg (89%) of 2-acetyl-6-phenylpyridine as a white powder. 1H NMR (CDCl3); δ 2.84 (s, 3H); 7.43-7.62 (m, 3 H); 7.91-8.08 (m, 3 H); 8.18 (d, J=6.6 Hz, 2H). Mass Spec.: m/e 197.

Workup

customof degassed 4:1 H2O/MeOH
temperatureOn cooling to RT
additionEt2O (50 mL) was added
customthe layers were separated
dry with materialThe organic layer was dried over Na2SO4
customthe volatiles were removed by rotary evaporation
customThe resulting oil was chromatographed on silica with 10-50% CH2Cl2/hexanes eluent

Sources & evidence

ORD record: ord-3d9fd253805c4a7bb2a7c0ac58183944
Source dataset: uspto-grants-2003_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06670298B1

Reaction notes

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