Ring contraction of 1,2,4-triazepino[2,3-a]benzimidazol-4-ones. New fused .beta.-lactams
摘要:
Isolation of uncommon fused tetracyclic beta-lactams 2 strongly supports a previously unconfirmed ionic mechanism for the ring contraction of nitrogen-bridged azolo-1,2,4-triazepin-3-ones in acetic anhydride. Procedures for the synthesis in good yields of substituted-pyrazolo[1,5-alpha]benzimidazoles from the corresponding [1,2,4]triazepino[2,3-alpha]benzimidazoles are reported.
DOI:
10.1021/jo00001a017
作为产物:
描述:
(9ci)-1H-苯并咪唑-1,2-二胺 、 alkaline earth salt of/the/ methylsulfuric acid 以30%的产率得到2-propyl-3H-<1.2.4>triazepino<2.3-a>benzimidazol-4-one
参考文献:
名称:
Ring contraction of 1,2,4-triazepino[2,3-a]benzimidazol-4-ones. New fused .beta.-lactams
摘要:
Isolation of uncommon fused tetracyclic beta-lactams 2 strongly supports a previously unconfirmed ionic mechanism for the ring contraction of nitrogen-bridged azolo-1,2,4-triazepin-3-ones in acetic anhydride. Procedures for the synthesis in good yields of substituted-pyrazolo[1,5-alpha]benzimidazoles from the corresponding [1,2,4]triazepino[2,3-alpha]benzimidazoles are reported.