Abstract
The title substances and their [1]benzothieno analogues were synthesized by reaction of 3-allyl-2-mercapto-([1]benzo)thieno-[2.3—d]pyrimidine-4(3H)-ones with Br2 to 2-bromomethyl-2.3-dihydro-thiazolo[3.2—a]([1]benzo-)thieno[2.3—d]pyrimidine-5-ones, which on treatment with morpholine did not give the corresponding morpholine derivatives but elimination to the exocyclic double bond. These 2-methylene-2.3-dihydro-products were isomerized by H2SO4 to the corresponding 2-methyl compounds.
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Literatur
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Sauter, F., Deinhammer, W. & Danksagmüller, K. Synthese von 2-Methylen-2,3-dihydro- und 2-Methyl-5H-thiazolo[3,2—a]thieno[2,3—d]pyrimidinen. Monatshefte für Chemie 105, 863–868 (1974). https://doi.org/10.1007/BF00912986
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DOI: https://doi.org/10.1007/BF00912986