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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 91, No. 9, 2015, pp.1715-1721
Published online, 11th August, 2015
Published online, 11th August, 2015
DOI: 10.3987/COM-15-13288
■ Synthesis of the Aglycon of Pentalinonside
Nobuhisa Isaka, Saki Kawada, Masaji Ishiguro,* and Minoru Tamiya*
*Chemical Biology Laboratory, Department of Applied Life Sciences, Niigata University of Pharmacy and Applied Life Sciences, 265-1, Higashijima, Niigata 956-8603, Japan
Abstract
The aglycon of pentalinonside (2), a novel seco-pregnane with cage-like DEF-rings, was synthesized. Polyoxygenated DEF-rings were constructed using a known 14,20(16),21(15)-triol derivative via 5-exo-cyclization for the F-ring annulation, followed by C14–21(15) oxidative cleavage and intramolecular acetalization.
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