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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 22, No. 11, 1984, pp.2513-2516
Published online, 1st January, 1970■ New Condensed Tri- and Tetracyclic Pyrazole Ring System
Published online, 1st January, 1970
DOI: 10.3987/R-1984-11-2513
■ New Condensed Tri- and Tetracyclic Pyrazole Ring System
Jan Svetlík*
*Drug Research Institute, Palárikova 31, 811 04 Bratislava, Slovakia
Abstract
1 -Phenylpyrazolo[4,3-e]pyrrole[1,2]pyracolo[1,2-a]pyrazine and its 5-aza analogue were synthesized from ethyl 5-amino-1-phenylpyrazole-4-carboxylate. Additional azole ring amelations onthe pyrazine part of the first heterocycle afforded new tetracyclic systems with two common nitrogen atoms,
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