Benzaldehyde dimethyl acetal → HCID 89569177, compound

Participants

Reaction Conditions

Reaction Steps

A solution of ethyl (1R,2R)-1,2-bis(hydroxymethyl)cyclopropanecarboxylate (10.5 kg, 60.3 mol) in cyclohexane (105.0 L) was added in a reactor. Then, benzaldehyde dimethylacetal (11.6 kg, 76.4 mol) followed by camphor sulfonic acid (73.0 g) was added into the reactor. The reaction mass was heated to reflux and a portion of solvent was distilled azeotropically. The progress of the reaction was monitored by HPLC. On completion of the reaction, the reaction mass was distilled to remove most of the solvent under reduced pressure below 45° C. To the concentrate, petroleum ether (32.0 L) was added and stirred to precipitate the product. The slurry was cooled to 0-5° C. and stirred for 15 min. The slurry was filtered and washed with cold petroleum ether (11.0 L). The product was dissolved in dichloromethane (210.0 L) and washed with water (52.0 L) followed by brine (53.0 L). The organic layer was dried over sodium sulfate (5.5 kg) and was distilled to remove most of the solvent. Petroleum ether (21.0 L) was added and stirred at 25-30° C. for 30 min to get the complete precipitation of the product. The slurry was further cooled to 0-5° C. and stirred for 60 min. The slurry was filtered and washed with cold petroleum ether (11.0 L). The product was dried in a vacuum tray dryer for 12 hours below 45-50° C. to afford 10.25 Kg (64.5%) of the title compound (4c).

Provenance & Evidence