INDIRECT ELECTROREDUCTIVE CYCLIZATION FOR SYNTHESES OF KEY INTERMEDIATES OF SEVERAL INDOLE AND IPECAC ALKALOIDS

Masataka IHARA; Fumihito SETSU; Yuji TOKUNAGA; Keiichiro FUKUMOTO; Yoshitomo KASHIWAGI; Tetsuo OSA

doi:10.1248/cpb.43.362

Masataka IHARA, Fumihito SETSU, Yuji TOKUNAGA, Keiichiro FUKUMOTO, Yoshitomo KASHIWAGI, Tetsuo OSA

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Keywords: indirect electroreductive cyclization, alkaloid synthesis, VB_12a, Ni(II) complex, electron-transfer catalyst

JOURNAL FREE ACCESS

1995 Volume 43 Issue 2 Pages 362-364

DOI https://doi.org/10.1248/cpb.43.362

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Abstract

Indirect electroreductive cyclization of η-bromo-α, β-unsaturated esters 1-6 using Co(III) or Ni(II)complex as an electron-transfer catalyst provided the six membered compounds 7-12, which are useful synthetic intermediates of several indole and ipecac alkaloids.

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