Abstract
The mechanism of formation of cyclobutene ring from methyl 2-methoxy-and 2-phenyl-N-methylbuta-2,3-dienimidothioates (H2C=C=C(R)-C(SMe)=NMe, 1-aza-1,3,4-trienes) was studied by quantum-chemical methods. The limiting stage in the [1,3]-sigmatropic migration of the methylsulfanyl group was found to follow a reaction path involving a “collapsed” state of the azatriene with linear configuration of the C=N-Me fragment, which is characterized by reduced activation barrier. The results of calculations substantiate preferential formation of pyrrole and dihydropyridine heterorings in the thermolysis of methyl 2-methoxy-N-methylbuta-2,3-dienimidothioate and of dihydropyridine and cyclobutene structures in the thermolysis of methyl N-methyl-2-phenylbuta-2,3-dienimidothioate.
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