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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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Paper | Regular issue | Vol 29, No. 8, 1989, pp.1601-1605
Published online, 1st January, 1970■ Convenient Preparations of 1,8-Dioxo-6-thioxopimerazino[1,2-c]perhydropyrimidines
Published online, 1st January, 1970
DOI: 10.3987/COM-89-5025
■ Convenient Preparations of 1,8-Dioxo-6-thioxopimerazino[1,2-c]perhydropyrimidines
Tadashi Ohkawara, Shigenori Matsumoto, Tetsuo Yamasaki,and Mitsuru Furukawa
*Faculty of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-hon-machi, Kumamoto 862-0973, Japan
Abstract
Hydrolysis of 4-thiocarbamoyl-3-ethoxycarbonylmethylpiperazin-2-ones 3 in alkaline solution followed by acidification afforded 1,8-dioxo-6-thioxopiperazino[1,2-c]perhydropyrimidines 4 in 65-85% yields.
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