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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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Note | Regular issue | Vol 60, No. 6, 2003, pp.1419-1424
Published online, 28th April, 2003■ Dependence of Ring Size on Conditions in Cyclization of 4-Methylaminobenzoic Acid by Dichlorotriphenylphosphorane
Published online, 28th April, 2003
DOI: 10.3987/COM-03-9752
■ Dependence of Ring Size on Conditions in Cyclization of 4-Methylaminobenzoic Acid by Dichlorotriphenylphosphorane
Isao Azumaya,* Takao Okamoto, Imabeppu Fumiaki and Hiroaki Takayanagi
*School of Pharmaceutical Sciences, Kitasato University, Shirokane, Minato-ku, Tokyo 108-8641, Japan
Abstract
4-Aminobenzoic acid was effectively coupled by dichlorotriphenylphosphorane to give cyclized aromatic amides with various ring sizes. Major compounds were trimer and hexamer. The ratios and yields of the compounds obtained by the reaction depended on the reaction conditions.
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