Potassium Carbonate → 7-(2-m-Tolyl-ethoxy)-benzo[1,3]dioxole-5-carboxylic Acid 2-m-tolyl-ethyl Ester

HRID 1918334Notes

Reaction equation

[OH:1][C:2]1[C:7]2[O:8][CH2:9][O:10][C:6]=2[CH:5]=[C:4]([C:11]([OH:13])=[O:12])[CH:3]=1.Br[CH2:15][CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([CH3:23])[CH:18]=1.C(=O)([O-])[O-].[K+].[K+]>CN(C=O)C>[C:19]1([CH3:23])[CH:20]=[CH:21][CH:22]=[C:17]([CH2:16][CH2:15][O:12][C:11]([C:4]2[CH:3]=[C:2]([O:1][CH2:15][CH2:16][C:17]3[CH:18]=[C:19]([CH3:23])[CH:20]=[CH:21][CH:22]=3)[C:7]3[O:8][CH2:9][O:10][C:6]=3[CH:5]=2)=[O:13])[CH:18]=1

Participants

Conditions

Temperature: 90 °C

Procedure

2.5 g of 7-hydroxy-benzo[1,3]dioxole-5-carboxylic acid, 6.8 g of 1-(2-bromo-ethyl)-3-methyl-benzene and 7.6 g of potassium carbonate were stirred in 100 ml of anhydrous DMF for 10 h at 80° C. Then another 1.4 g of 1-(2-bromo-ethyl)-3-methyl-benzene and 1.5 g of potassium carbonate were added and the mixture was stirred for 5 h at 90° C. The solvent was removed in vacuo and the residue dissolved in 200 ml of water and 200 ml of EA. The organic layer was separated, washed with 100 ml of a saturated aqueous sodium carbonate solution, dried with magnesium sulfate and evaporated to yield 4.5 g of the title compound.

Workup

customThe solvent was removed in vacuo
dissolutionthe residue dissolved in 200 ml of water
customThe organic layer was separated
washwashed with 100 ml of a saturated aqueous sodium carbonate solution
dry with materialdried with magnesium sulfate
customevaporated

Sources & evidence

ORD record: ord-815eaa6f7c864670a42d42630158ea6b
Source dataset: uspto-grants-2013_12
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08618304B2

Reaction notes

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