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Lewis Acid Mediated [1,2]-Rearrangment of Ammonium Ylides.

✍ Scribed by Pavel Tuzina; Peter Somfai

Publisher: John Wiley and Sons
Year: 2007
Weight: 20 KB
Volume: 38
Category: Article
ISSN: 0931-7597
DOI: 10.1002/chin.200743083

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Synthesis of 1-Acyl-1,2-dihydro-3H-pyraz

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## Abstract magnified image The unusual formation of 1‐acyl‐1,2‐dihydro‐3__H__‐pyrazol‐3‐ones starting from 3‐acyloxypyrazoles by Fries‐type rearrangement is described. Under normal conditions, acylation of 2,4‐dihydro‐3__H__‐pyrazol‐3‐ones **1** and **2** with acid chlorides or anhydrides in the