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Obituary
Yoshito Kishi (1937-2023)
Yoshito Kishi (1937-2023)
Professor. Yoshito Kishi,
a member of the Honorary Editorial Associates of HETEROCYCLES,
has passed away on January 9, 2023 at the age of 85.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
January 13, 2023
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Communication | Regular issue | Vol 26, No. 6, 1987, pp.1495-1498
Published online, 1st January, 1970■ Reaction of 2,4,6-Trimethylpyrylium Salt with Organocopper Reagents: Selective Synthesis of 4H-Pyrans
Published online, 1st January, 1970
DOI: 10.3987/R-1987-06-1495
■ Reaction of 2,4,6-Trimethylpyrylium Salt with Organocopper Reagents: Selective Synthesis of 4H-Pyrans
Yohsuke Yamamoto, Takashi Kume, and Kin-ya Akiba
*Department of Chemistry, Faculty of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
Abstract
Various cuprates (R2CuLi or R2CuMgBr) reacted with 2,4,6-trimethylpyrylium tetrafluoroborate (1) at 4-position to give 4H-pyrans with good regioselectivity (4H-:2H-≥7:3) in high total yield (75-90 %). One-pot transformation of 4H-pyrans into cyclohexenones is also described.
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