title: [5C + 1S] annulation: a facile and efficient synthetic route toward functionalized 2,3-dihydrothiopyran-4-ones.
abstract: [reaction: see text] A facile and efficient synthetic route toward highly substituted 2,3-dihydrothiopyran-4-ones 2 has been developed via a formal [5C + 1S] annulation of readily available alpha-alkenoyl ketene-(S,S)-acetals 1 with sodium sulfide nonahydrated salt (Na2S x 9H2O) and utilized in the synthesis of 2-(4-chlorophenyl)-6-(morpholin-4-yl)-4H-thiopyran-4-one 5l, an inhibitor of DNA-dependent protein kinase (DNA-PK).
authors.affiliation: Department of Chemistry, Northeast Normal University, Changchun 130024, PR China.
authors.forename: Xihe
authors.initials: X
authors.lastname: Bi
authors.forename: Dewen
authors.initials: D
authors.lastname: Dong
authors.forename: Yan
authors.initials: Y
authors.lastname: Li
authors.forename: Qun
authors.initials: Q
authors.lastname: Liu
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang