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Synthesis of 1-Acyl-1,2-dihydro-3H-pyrazol-3-ones via Lewis Acid-Mediated Rearrangement of 3-Acyloxypyrazoles.

✍ Scribed by Hiroshi Maruoka; Kenji Yamagata; Fumi Okabe; Yukihiko Tomioka

Publisher
John Wiley and Sons
Year
2006
Weight
22 KB
Volume
37
Category
Article
ISSN
0931-7597

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Synthesis of 1-acyl-1,2-dihydro-3H-pyraz
Synthesis of 1-acyl-1,2-dihydro-3H-pyrazol-3-ones VIA lewis acid-mediated rearrangement of 3-acyloxypyrazoles
✍ Hiroshi Maruoka; Kenji Yamagata; Fumi Okabe; Yukihiko Tomioka 📂 Article 📅 2006 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 140 KB

## 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

Synthesis of 1-methyl-, 4-nitro-, 4-amin
Synthesis of 1-methyl-, 4-nitro-, 4-amino-and 4-iodo-1,2-dihydro-3H-pyrazol-3-ones
✍ Y. C. Fiamegos; G. A. Pilidis; G. Varvounis 📂 Article 📅 2001 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 44 KB

## Abstract 4‐Aminopyrazole‐3‐ones **4b, e, f** were prepared from pyrazole‐3‐ones **1b‐d** in a four‐step reaction sequence. Reaction of the latter with methyl __p__‐toluenesulfonate gave 1‐methylpyrazol‐3‐ones **2b‐d**. Compounds **2b‐d** were treated with aqueous nitric acid to give 4‐nitropyraz