HETEROCYCLES
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Obituary
Zenichi Yoshida (1925-2023)
Zenichi Yoshida (1925-2023)
Professor. Zenichi Yoshida,
a member of the Honorary Advisors of HETEROCYCLES (1975-1998),
has passed away on May 4, 2023 at the age of 97.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
May 11, 2023
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Report | Regular issue | Vol 22, No. 9, 1984, pp.1995-2005
Published online, 1st January, 1970■ Synthesis of Some Neodihydrothebaine and Bractazonine Isomers
Published online, 1st January, 1970
DOI: 10.3987/R-1984-09-1995
■ Synthesis of Some Neodihydrothebaine and Bractazonine Isomers
Hubert G. Theuns,* Herman B. M. Lenting, Cornelis A. Salemink, Hitoshi Tanaka, Masayoshi Shibata, Kazuo Ito, and Robert J. J. Ch. Lousberg
*Laboratory of Organic Chemistry, Agricultural University, De Dreijen 5, 6703 BC Wageningen, The Netherlands
Abstract
The synthesis of four isomeric dibenz[d,f]azonine compounds is described. Neither of these substances may be confused with the natural Papaver bracteatum alkaloids neodihydrothebaine and bractazonine.
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