Monatshefte fur Chemie p. 863 - 868 (1974)
Update date:2022-08-17
Topics:
Sauter
Deinhammer
Danksagmueller
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(3 H)-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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