Abstract
A new approach has been proposed to the synthesis of indole derivatives containing a chiral substituent at the nitrogen atom, comprizing Fischer indolization of phenylhydrazines with a chiral substituent at the α-nitrogen atom. The initial hydrazines were obtained by the alkylation (Mitsunobu reaction applying optically active esters of lactic acid) of anilines containing an electron-accepting substituent at the amino group. Subsequent removal of the activating acceptor grouping was realized by nitrosation of the chiral secondary aniline followed by reduction of the corresponding N-nitroso compound.
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Kurkin, A.V., Nesterov, V.V., Karchava, A.V. et al. Synthesis of Nonracemic 9-(1-Methoxycarbonylethyl)-1,2,3,4-tetrahydrocarbazole. Chemistry of Heterocyclic Compounds 39, 1466–1477 (2003). https://doi.org/10.1023/B:COHC.0000014411.33252.d1
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DOI: https://doi.org/10.1023/B:COHC.0000014411.33252.d1