Oxazole → N-Methyl-5-oxazol-2-yl-N-propyl-isophthalamic acid methyl ester

HRID 1436635Notes

Reaction equation

C([Li])CCC.[O:6]1[CH:10]=[CH:9][N:8]=[CH:7]1.[CH3:11][O:12][C:13](=[O:28])[C:14]1[CH:26]=[C:25](I)[CH:24]=[C:16]([C:17]([N:19]([CH3:23])[CH2:20][CH2:21][CH3:22])=[O:18])[CH:15]=1>C1COCC1.C(OCC)C.[Cl-].[Zn+2].[Cl-].C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.C1C=CC(/C=C/C(/C=C/C2C=CC=CC=2)=O)=CC=1.[Pd].[Pd]>[CH3:11][O:12][C:13](=[O:28])[C:14]1[CH:26]=[C:25]([C:7]2[O:6][CH:10]=[CH:9][N:8]=2)[CH:24]=[C:16]([C:17]([N:19]([CH3:23])[CH2:20][CH2:21][CH3:22])=[O:18])[CH:15]=1

Participants

Conditions

Temperature: -78 °C

Procedure

Add n-butyllithium (1.6 M in hexanes, 1.25 mL, 2.01 mmol) dropwise to a solution of oxazole (126 mg, 1.83 mmol) in THF (12.6 mL) at −78° C. Stir for 30 min at −78° C. and add a solution of zinc chloride (747 mg, 5.49 mmol) in diethyl ether (5.5 mL) and stir at 0° C. for 1 h. Add a solution of 5-iodo-N-methyl-N-propyl-isophthalamic acid methyl ester (330 mg, 0.91 mmol) in THF (5.1 mL) followed by tetrakis(triphenylphosphine)palladium (0) (105 mg, 0.091 mmol) and heat to reflux for 30 min. Add ethyl acetate (40 mL), wash with water (2×20 mL), dry (magnesium sulfate), concentrate and purify (silica gel chromatography, eluting with 50:50 ethyl acetate:hexane) to give the title compound (225 mg, 82%).

Workup

stirringstir at 0° C. for 1 h
temperatureheat
temperatureto reflux for 30 min
washAdd ethyl acetate (40 mL), wash with water (2×20 mL)
dry with materialdry (magnesium sulfate)
concentrationconcentrate
custompurify
wash(silica gel chromatography, eluting with 50:50 ethyl acetate:hexane)

Sources & evidence

ORD record: ord-0efb2fd9500a41b2bb87eb1f1f93f735
Source dataset: uspto-grants-2009_11
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07618978B2

Reaction notes

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