Reaction of 2-(5-aminopyrazol-1-yl)quinoxaline 4-oxides with dimethyl acetylenedicarboxylate
✍ Scribed by Yoshihisa Kurasawa; Ritsuko Katoh; Fumiko Mori; Minori Fukuchi; Megumi Okamoto; Atsushi Takada; Ho Sik Kim; Yoshihisa Okamoto
- Book ID
- 112130387
- Publisher
- Journal of Heterocyclic Chemistry
- Year
- 1992
- Tongue
- English
- Weight
- 166 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0022-152X
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📜 SIMILAR VOLUMES
## Abstract The reaction of 6‐chloro‐2‐hydrazinoquinoxaline 4‐oxide **1b** with acetylacetone or benzoylacetone gave 6‐chloro‐2‐(3,5‐dimethylpyrazol‐i‐yl)quinoxaline 4‐oxide **5a** or 6‐chloro‐2‐(3‐methyl‐5‐phenylpyrazol‐1‐yl)quinoxaline 4‐oxide **5b**, respXectively. Compound **5a** or **5b** was
## Abstract A new method for the preparation of 1,4,5‐trisubstituted (imidazol‐2‐yl)acetates, based on the reaction of the corresponding imidazole 3‐oxides with dimethyl acetylenedicarboxylate (DMAD) is described. Formation of the products is rationalized by a formal 1,3‐dipolar cycloaddition and s