A new route to 1,5-disubstituted 4-arylsulfonylpyrazoles by lithiation of 1-methyl-4-arylsulfonylpyrazoles
✍ Scribed by Michael G. Hoffmann
- Publisher
- Elsevier Science
- Year
- 1995
- Tongue
- French
- Weight
- 515 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0040-4020
No coin nor oath required. For personal study only.
📜 SIMILAR VOLUMES
1,4-Disubstituted 5-thioxoperhydroimidazo [4,5-d]imidazol-2-ones were prepared by one-pot criss-cross cycloaddition reactions of 1,4-disubstituted 1,4-diazabuta-1,3-dienes with HNCS and HNCO generated in situ from potassium salts by acetic acid.
The synthesis of new 3-substituted a-carbolines is described and these products were subjected to ortho-lithiation experiments. 3-pivalamido and 3-carboxamido derivatives are cleanly lithiated at 4position. The results are correlated with MNDO calculations. Various 3,4-disubstituted a-carbolines are
## Abstract magnified image A novel series of 2,4‐disubstituted‐1,2,4‐triazolo[1,5‐__a__]quinazolin‐5(4__H__)‐ones were prepared by Dimroth rearrangement of their respective isomers namely 1,4‐disubstituted‐[1,2,4]triazolo[4,3‐__a__]‐quinazolin‐5(4__H__)‐ones. The latter were prepared __via__ new