Vilsmeier-Haack-Arnold and Bromination Reactions of 4H-Pyrazolo(1,5-a)indole Derivatives.
作者:Jing-Kang SHEN、Hajime KATAYAMA、Noriyuki TAKATSU
DOI:10.1248/cpb.42.237
日期:——
As typical electrophilic substitution reactions of the 4H-pyrazolo[1, 5-a]indole derivatives, the Vilsmeier-Haack-Arnold (V.H.A.) and bromination reactions were investigated in detail and mechanisms involving the 1H-pyrazolo[1, 5-a]indoles as reaction intermediates are proposed. The V.H.A. reaction products were subjected to oxidative and reductive reactions, and a novel reduction of the conjugated system involving a double bond in the aromatic (pyrazole) ring was observed. Reaction pathways for these reactions are also proposed.
作为 4H-吡唑并[1, 5-a]吲哚衍生物的典型亲电取代反应,详细研究了 Vilsmeier-Haack-Arnold (V.H.A.) 反应和溴化反应,并提出了以 1H-吡唑并[1, 5-a]吲哚为反应中间体的机理。对 V.H.A. 反应产物进行了氧化和还原反应,观察到一种涉及芳香(吡唑)环双键的共轭体系的新型还原反应。还提出了这些反应的反应途径。