T. Saito et al., INTRAMOLECULAR DIENE-TRANSMISSIVE HETERO-DIELS-ALDER REACTIONS OF DIVINYL THIOKETONES, Chemical communications, (7), 1996, pp. 811-812
The intramolecular diene-transmissive hetero Diels-Alder reactions of
divinyl thioketones to give polyring-fused tetrahydrothiopyrans are de
scribed for the first time.