Synthesis of 2,3-Dihydrobenzo[b]thiophen-3-amine 1,1-Dioxide Derivatives via LDA-Mediated Cyclization of o-(Alkylsulfonyl)benzyl Azides with Denitrogenation
作者:Kazuhiro Kobayashi、Yuuki Chikazawa、Takashi Nogi
DOI:10.3987/com-17-13743
日期:——
A new and efficient method for the synthesis of 2,3-dihydrobenzo[b]thiophen-3-amine 1,1-dioxide derivatives has been developed. Thus, treatment of o-(alkylsulfonyl)benzyl azides, which are readily obtainable from commercially available starting materials by easily operational sequences, with lithium diisopropylamide (LDA) in THE at -78 degrees C gives, after aqueous workup, 2,3-dihydrobenzo[b]thiophen-3-amine 1,1-dioxides. These products can be isolated in moderate to fair yields after N-protection with acylating agents.