H. Morita et al., THIAPYRAN FORMATION VIA AN UNEXPECTED THIOALDEHYDE INTERMEDIATE BY THE THERMAL-DECOMPOSITION OF PHENACYL SULFOXIDES BEARING SOME HETEROCYCLES, Tetrahedron letters, 37(21), 1996, pp. 3739-3740
Thermolysis of phenacyl sulfoxide bearing some nitrogen-containing het
erocycles in the presence of 2,3-dimethyl-1,3-butadiene led to 6-benzo
yl-5,6-dihydro-3,4-dimethyl-2H-thiapyran. This product was considered
to be formed by the Diels-Alder reaction of the diene with thioaldehyd
e formed initially by the thermal decomposition of the sulfoxide. Copy
right (C) 1996 Elsevier Science Ltd