One-pot synthesis of trans-2,3-diaminoindolines through 2,3-diamination of electrophilic indolines
Yuito Kobori1, Keisuke Tokushige1, Takumi Abe1
1Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 1-1-1 Tsushima-naka, Kita-ku, Okayama 7008530, Japan. t-abe@okayama-u.ac.jp.
Abstract:
Despite recent advances in the synthesis of 2,3-diaminoindole derivatives, construction of 2,3-diaminoindolines, whose two amine moieties on each molecule differ from one another has yet to be achieved. In this work, we developed a concise one-pot protocol for differentiated diamination involving reacting a C2,C3-electrophilic indole reagent with amines to access a variety of previously inaccessible 2,3-diaminoindolines. Furthermore, the synthetic utility of this protocol was demonstrated by a successful gram-scale reaction and further transformation of the 2,3-diaminoindolines.
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