v??Triazolines, XXIV. Pyrazolecarbaldehydes from 5??Amino??4, 5??dihydro??4??methylene??v??triazoles and Sydnones

…, E Erba, L Forti, D Pocar, D Scarcella

文献索引：Destro, Riccardo; Erba, Emanuela; Forti, Luciana; Pocar, Donato; Scarcella, Daniela Liebigs Annalen der Chemie, 1985 , # 7 p. 1377 - 1388

全文：HTML全文

被引用次数: 2

摘要

Abstract The sydnones 1a–c react with the 4, 5-dihydro-v-triazoles 2a–c by long refluxing at 110–140 C affording via non-isolable adducts with elimination of CO 2 and N 2 and rearrangement a mixture of 4, 5-dihydropyrazoles 3a–c, 3-pyrazolecarbaldehyde anils 4a–d, and 3-pyrazolecarbaldehydes 5a–c. Compounds 3 can be deaminated to give 4 which can be hydrolyzed to yield the 3-pyrazolecarbaldehydes 5.–The sydnones 6a, b react similarly ...