Reactions with 2??methyl??and 2??styryl??4??thiochromones

…, HA El??Bary, S Yassin, M Zahran

Index: Zeid, Ibrahim; El-Bary, Hamed Abd; Yassin, Salah; Zahran, Magdy Liebigs Annalen der Chemie, 1984 , # 1 p. 186 - 190

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Abstract

Abstract Diazoalkanes react with 2-methyl-and 2-styryl-4-thiochromones to yield the 1, 3- dithiolanes 1 and/or ethylenes 2–4. The latter are cleaved with thionyl chloride to give the corresponding ketones, while on fusion with sulfur they afford the corresponding thioketones. By condensation with compounds containing active hydrogen, such as malononitrile and ethyl cyanoacetate, the 2-methyl-and 2-styryl-4-thiochromones yield the ...

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