HETEROCYCLES
An International Journal for Reviews and Communications in Heterocyclic ChemistryWeb Edition ISSN: 1881-0942
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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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Note | Regular issue | Vol 53, No. 10, 2000, pp.2275-2278
Published online, 1st January, 1970■ Solvent-free Synthesis of Thio-alkylxanthines from Alkylxanthines Using Microwave Irradiation
Published online, 1st January, 1970
DOI: 10.3987/COM-00-9003
■ Solvent-free Synthesis of Thio-alkylxanthines from Alkylxanthines Using Microwave Irradiation
Rodrigo Rico-Gómez,* Francisco Nájera, Juan Manuel López-Romero, and Pedro Cañada-Rudner
*Departamento de Química Orgánica, Universidad de Malága, E-29071 Malága, Spain
Abstract
An expeditious, solvent-free procedure for the conversion of the xanthine bases theophylline, 8-methyltheophylline, caffeine, and theobromine to the corresponding 6-thio and 2,6-dithio derivatives using Lawesson’s reagent under microwave irradiation is proposed.
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