A mixture of phthalimide 5 (1 mmol), hydroxybezaldehyde derivative 6 (1 mmol), and K2CO3 (1.3 mmol) in DMF (10 mL) was heated at 80 °C for 8 h. Upon completion of the following reaction, the mixture was poured into crushed ice, and the precipitate was filtered off and dried, affording aldehyde 7 [28 (link)].
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