A simple regioselective synthesis of ethyl 1,5-diarylpyrazole-3-carboxylates
✍ Scribed by William V. Murray; Michael P. Wachter
- Book ID
- 112129384
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1989
- Tongue
- English
- Weight
- 228 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0022-152X
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
Ethyl 1,2,4-triazine-5-carboxylates 6 were prepared by heating N,N-dimethylaminomethyleneor ethoxymethylenehydrazones 5 with ammonium acetate in acetic acid at-100°C. NMR-studies confirmed the absence of their regio isomers (6-carboxylates), showing the high regioselectivity of this procedure. Rece
## Abstract 4‐Ethoxycarbonyl‐5‐phenyl‐2,3‐dihydrofuran‐2,3‐dione **1** reacts with aldehydes __via__ the acylketene intermediate **2** giving the 1,3‐dioxin‐4‐ones **3a‐e** and the 1,4‐bis(5‐ethoxycarbonyl‐4‐oxo‐6‐phenyl‐4__H__‐1,3‐dioxin‐2‐yl)benzene **4**, and a one step reaction between dibenzoy