Gram-Scale Preparation of Acyl Fluorides and Their Reactions with Hindered Nucleophiles

Abstract

A series of acyl fluorides was synthesized at 100 mmol scale using phase-transfer-catalyzed halogen exchange between acyl chlorides and aqueous bifluoride solution. The convenient procedure consists of vigorous stirring of the biphasic mixture at room temperature, followed by extraction and distillation. Isolated acyl fluorides (usually 7–20 g) display excellent purity and can be transformed into sterically hindered amides and esters when treated with lithium amide bases and alkoxides under mild conditions.

Key words

acyl fluorides - phase-transfer catalysis - directed ortho-metalation - amides - esters

Publikationsverlauf

Eingereicht: 10. September 2021

Angenommen nach Revision: 20. September 2021

Accepted Manuscript online:
20. September 2021

Artikel online veröffentlicht:
16. November 2021

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