Toluene → HCID 22493536, compound

Participants

Reaction Steps

1,2,3-Trimethylindoline (21.5 g) was formylated in a similar manner to that described in Step 2 of Example 1 to obtain 20.1 g of 1,2,3-trimethylindoline-5-carbaldehyde. The obtained aldehyde (7.5 g) was dissolved in 200 ml of 1,4-dioxane, followed by the addition of 18 g of DDQ. The obtained mixture was heated under reflux for 2.5 hours, followed by the addition of 100 ml of toluene. Insolubles were filtered out and the organic phase was concentrated in a vacuum. The obtained residue was purified by flash column chromatography to give 900 mg of the title compound.

Provenance & Evidence