V. Nair et al., Novel cycloadditions of ortho-thioquinones with acyclic dienes: expeditious synthesis of 1,4-benzooxathiines, J CHEM S P1, (22), 2001, pp. 3020-3024
ortho-Thioquinones generated in situ from N-(o-hydroxyphenylsulfanyl) phtha
limides easily undergo [4+2] cycloaddition reaction with acyclic dienes to
a ord novel heterocyclic compounds.