Diethyl methylmalonate → 2-Methyl-4-bromo-1-indanone ethylene ketal

Participants

Reaction Steps

To a solution of 4.88 g of 2-methyl-4-bromo-1-indanone derived from 2-bromobenzyl bromide and diethyl methylmalonate in 12 ml of ethylene glycol was added 5.4 ml of ethyl orthoformate. After a catalytic amount of p-toluenesulfonic acid monohydrate was added, the mixture was stirred overnight at room temperature. The reaction mixture was poured into saturated aqueous sodium hydrogen carbonate and extracted with ether. After the organic layer was dried over magnesium sulfate, the solvent was removed by distillation under reduced pressure. The residual concentrate was purified by silica gel column chromatography to give 4.08 g of the title compound.

Provenance & Evidence