Structure and reactivity of enamines derived from 5,6-dihydro-2H-thiapyran-3(4H)-one 1,1-dioxide

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Abstract
The structures and the reactivities of the title vinylogous sulphonamides are compared with those of the corresponding vinylogous amides derived from cyclohexane-1,3-dione. Their behaviour on alkylation, acylation, and addition-substitution has been studied. Isolation of some of the products can be explained in terms of the existence of a tautomeric equilibrium in the parent systems.

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