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Short Paper | Regular issue | Vol 98, No. 4, 2019, pp.564-569
Published online, 15th March, 2019
DOI: 10.3987/COM-19-14055
Synthesis of [1,4]Oxathiino[2,3-d]pyrimidines Starting with 4,6-Dichloro-2-(methylsulfanyl)pyrimidine

Kazuhiro Kobayashi,* Kota Yamasaki, Hidetaka Hiyoshi, and Kazuto Umezu

*Applied Chemistry Field, Chemistry and Biotechnology Course, Department of Engineering, Graduate School of Sustainability Science, Tottori University, 4-101 Koyama-minami, Tottori 680-8552, Japan


A convenient method for the preparation of 7-(het)aryl[1,4]oxathiino[2,3-d]pyrimidine derivatives using an easily operated two-step sequence starting from 4,6-dichloro-2-(methylsulfanyl)pyrimidine (DCSMP) have been developed. Thus, the starting material is treated with LDA to generate the 5-lithio derivative, which is allowed to react with sulfur and then phenacyl bromide and its derivatives to give 1-(het)aryl-2-{[4,6-dichloro-2-(methylsulfanyl)pyrimidin-5-yl]sulfanyl}ethanones. These pyrimidinyl ketones undergo ring closure upon treatment with triethylamine to provide the corresponding desired products in reasonable overall yields from DCSMP.