Acetic Anhydride → HCID 69471805, compound

Participants

Reaction Steps

A mixture of 28.7 g (78 mmol) (28a), 135 ml of formic acid and 135 ml of acetic anhydride was stirred at room temperature for 1 day. The reaction was monitored by 1H-NMR and MS. After completed reaction the reaction mixture was poured into ice-water (800 ml). The pH was adjusted to 10 by the addition of 33% NaOH (aq). The aqueous layer was extracted with DCM (3×1 l). The combined organic layers were dried over Na2SO4 and concentrated in vacuo. The residue was dissolved in 550 ml tert.-butylalcohol, 45 ml water and 45 ml concentrated aqueous ammonia. The 90 ml of 35% hydrogen peroxide were added drop wise at room temperature. The mixture was stirred overnight. The reaction was monitored by TLC. 900 ml of water were added and the mixture was extracted with DCM (3×500 ml). The combined organic layers were dried over Na2SO4 and concentrated in vacuo to give 29.3 g (76 mmol, 98%) of (29a) as a yellow solid, which was used in the next step without purification.

Provenance & Evidence