Bf. Bonini et al., Chemistry of silyl thioketones: Studies concerning the regiochemistry of the cycloaddition with substituted 1,3-dienes, HETEROCYC C, 5(3), 1999, pp. 217-226
The cycloaddition between a series of silyl thioketones and substituted, op
en-chain 1,3-dienes was investigated: mixtures of regioisomeric 5,6-dihydro
(2H) thiopyrans are formed. The structures of the major isomers were assig
ned on the basis of both spectroscopic analysis and chemical correlations.