Zur Chemie der 2,4-Diaminothiopyranyliumjodide Synthese von α,β,γ,δ-ungesättigten Thiocarbonsäureamiden

Aminolysis of 4-dialkylamino- and 4-alkylamino-2-methylthiothiopyranyliden iodides2 resp. under various reaction conditions leads to assymmetrically or symmetrically substituted 2,4-bisamino- or 2,4-bisdialkylamino- and 2-alkylamino-4-dialkylamino-or 2-dialkylamino-4-alkylamino- or 2-amino-4-dialkylaminodihydrothiopyranylium iodides3, 4, 5, 6 resp. On treatment with alkali 4-alkylamino- and 4-dialkylamino-2-alkylaminothiopyranylium iodides3,4 are hydrolysed to the 2-alkylimino-2H-thiopyranes7. 4-Alkylamino-2-dialkylaminothiopyranylium iodides5 react with alkali to give three products: the two stereoisomeres 2-dialkylamino-4-alkylimino-4H-thiopyranes9 A,B and theN,N-substituted α,β,γ,δ-unsaturated thiocarboxamide10. The hydrolysis of 2,4-bisdialkylaminothiopyranylium iodide6 a leads to the 2-dialkylamino-4H-thiopyran-4-one11 a, the 4-dialkylamino-2H-thiopyrane-2-one12 and theN,N-substituted unsaturated thiocarboxamide10 d. α,β,γ,δ-unsaturated thiocarboxamides10 a-c are formed by the reaction of 2-amino-4-dialkylaminothiopyranylium iodides3 a-c with diluted alkali. By heating with acids10 a-c are cyclisized to the 2-aminothiopyranylium derivates3.