Propanoic acid, 2-bromo-2-methyl-, ethyl ester → Ethyl 2-{[3-(4-chlorophenyl)-1,2-benzisoxazol-6-yl]oxy}-2-methylpropionate

HRID 652936Notes

Reaction equation

[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[C:12]3[CH:13]=[CH:14][C:15]([OH:17])=[CH:16][C:11]=3[O:10][N:9]=2)=[CH:4][CH:3]=1.[H-].[Na+].Br[C:21]([CH3:28])([CH3:27])[C:22]([O:24][CH2:25][CH3:26])=[O:23]>CN(C)C=O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([C:8]2[C:12]3[CH:13]=[CH:14][C:15]([O:17][C:21]([CH3:28])([CH3:27])[C:22]([O:24][CH2:25][CH3:26])=[O:23])=[CH:16][C:11]=3[O:10][N:9]=2)=[CH:6][CH:7]=1

Participants

Conditions

Temperature: 80 °C

Procedure

A solution of 9.0 g of 3-(4-chlorophenyl)-6-hydroxy-1,2-benzisoxazole in 25 ml of dimethylformamide is added with stirring to a suspension of 1.93 g of sodium hydride (50% suspension in oil) in 25 ml dimethylformamide. To the mixture is added 5.5 ml of ethyl 2-bromo-2-methylpropionate. The reaction mixture is stirred 24 hr at 80° C., poured onto ice/water and extracted with ether. The ether extracts are combined and washed with dil sodium hydroxide solution and dried over anhydrous magnesium sulfate. The solvent is removed in vacuo to give a yellow oil which crystallizes on standing. Recrystallization from ether affords ethyl 2-{[3-(4-chlorophenyl)-1,2-benzisoxazol-6-yl]oxy}-2-methylpropionate, mp 70° C.

Workup

additionpoured onto ice/water
extractionextracted with ether
washwashed with dil sodium hydroxide solution
dry with materialdried over anhydrous magnesium sulfate
customThe solvent is removed in vacuo
customto give a yellow oil which
customcrystallizes
customRecrystallization from ether

Sources & evidence

ORD record: ord-fbc48ef97da848a99f867f0c6649cfcf
Source dataset: uspto-grants-1987_06
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US04673746

Reaction notes

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