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Obituary
Zenichi Yoshida (1925-2023)
Zenichi Yoshida (1925-2023)
Professor. Zenichi Yoshida,
a member of the Honorary Advisors of HETEROCYCLES (1975-1998),
has passed away on May 4, 2023 at the age of 97.
I deeply express my regret over his death.
Kunio Ogasawara
Editor
May 11, 2023
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Communication | Special issue | Vol 90, No. 2, 2015, pp.866-873
Published online, 13th August, 2014
Published online, 13th August, 2014
DOI: 10.3987/COM-14-S(K)90
■ Synthesis of Macrocyclic Penta- and Tetraoxazoles as G-Quadruplex Ligands
Shadi Sedghi Masoud, Yamato Tsushima, Keisuke Iida, and Kazuo Nagasawa*
*Biotechnology and Life Science, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei, Tokyo 184-8588, Japan
Abstract
The penta- and tetraoxazole telomestatin analogs L2H2-5OTD (4) and L2H2-4OTD (5) were synthesized as new G-quadruplex ligands in order to evaluate the influence of the size of the planar macrocycle on the G-quadruplex-stabilizing efficacy. These ligands were less potent stabilizers of various G-quadruplex-forming oligonucleotides than L2H2-6OTD (2a), which has a hexaoxazole-type macrocycle.
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