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Synthesis of 5,6-Dihydropyrazolo[5,1‑a]isoquinolines through Indium(III)-Promoted Halocyclizations of N‑Propargylic Sulfonylhydrazones

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posted on 18.03.2016, 17:34 by Ren-Hao Li, Cheng-Ke Ding, Ya-Nan Jiang, Zong-Cang Ding, Xiao-Ming An, Hai-Tao Tang, Qi-Wei Jing, Zhuang-Ping Zhan
A novel method for the preparation of 5,6-dihydropyrazolo­[5,1-a]­isoquinoline via indium­(III)-promoted halocyclizations of N-propargylic sulfonylhydrazones has been developed. The pyrazole and 3,4-dihydroisoquinoline moieties were synchronously formed via a cascade cyclization reaction using easily assembled open-chain compounds. The pyrazole and 3,4-dihydroisoquinoline moieties were formed via a cascade cyclization reaction using easily assembled open-chain compounds.

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