Potassium Carbonate → 5-(4-chlorophenyl)-3,4-dihydro-2H-pyran

HRID 1054883Notes

Reaction equation

Br[C:2]1[CH2:3][CH2:4][CH2:5][O:6][CH:7]=1.[Cl:8][C:9]1[CH:14]=[CH:13][C:12](B(O)O)=[CH:11][CH:10]=1.C(=O)([O-])[O-].[K+].[K+].C(O)C.O>C1(C)C=CC=CC=1>[Cl:8][C:9]1[CH:14]=[CH:13][C:12]([C:2]2[CH2:3][CH2:4][CH2:5][O:6][CH:7]=2)=[CH:11][CH:10]=1

Participants

Conditions

Temperature: 100 °C

Procedure

A mixture of 5-bromo-3,4-dihydro-2H-pyran (1.0 g, 6.13 mmol), (4-chlorophenyl)boronic acid (1.05 g, 6.74 mmol), potassium carbonate (2.5 g, 18.4 mmol), Pd(dppf)C12 (449 mg, 0.613 mmol), and ethanol/water (2/2 mL) in toluene (10 mL) was stirred at 100° C. for 12 hours. The mixture was filtered, and the filtrate was evaporated and purified by silica gel chromatography to give the title compound (700 mg, 58.8%) as orange solid. 1H NMR (400 MHz, CD3OD) δ ppm 7.25 (d, 2 H), 7.20 (d, 2 H) 6.90 (s, 1 H), 4.03 (t, 2 H), 2.37 (t, 2 H), 2.02 (m, 2 H)

Workup

filtrationThe mixture was filtered
customthe filtrate was evaporated
custompurified by silica gel chromatography

Sources & evidence

ORD record: ord-8571b9020ad740e4a3acca0e75e1b49c
Source dataset: uspto-grants-2016_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US09394285B2

Reaction notes

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