Monatshefte fur Chemie p. 1273 - 1281 (1996)
Update date:2022-07-29
Topics:
Bogdanowicz-Szwed
Krasodomska
Reaction of 1,3-diaza-1,3-butadienes (1a-c) with various ketenes and chloroketenes results in the formation of substituted 4-oxo-pyrimido[2,1-b]benzothiazoles(4a-d) and 1,3,4-thiadiazolo[3,2-a]pyrimido-4-ones (4e,f). Reaction of 1,3-diaza-1,3-butadienes 1d,e with ketenes and chloroketenes leads to the 2-morpholine-substituted compounds 7 and 15, respectively. All reactions proceed via formation of [4 + 2] cycloadducts that eliminate methylthiol, methylsulfenyl chloride, or morpholine.
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Doi:10.1134/S107036321311025X
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