| Abstract
| - Hydrocyanation of 2-(p-tolylsulfinyl)-1,4-benzoquinone (2) followed by oxidation with PhI(OAc)2 gives2-cyano-3-(p-tolylsulfinyl)-1,4-benzoquinone (1). The generation of 1 in the presence of cyclic and acyclic dienes affordsthe Diels−Alder adducts with a complete chemo- (onlyreaction with the sulfinyl-substituted double bond takesplace), regio- (controlled by the cyano group), and endoselectivity (with respect to the quinone moiety), whereas theπ-facial selectivity is dependent on the structure of the diene.
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