Synthesis of 3,4-Dihydro-2H-1,3-thiazines from α-Enolic Dithioesters and 1,3,5-Triazinanes via a Formal (3 + 3) Annulation Reaction

Abstract
The synthesis of 3,4-dihydro-2H-1,3-thiazines from α-enolic dithioesters and 1,3,5-triazinanes has been achieved via a formal (3 + 3) annulation reaction under thermal conditions, where 1,3,5-triazinanes were utilized as three-atom synthons. This transformation is catalyst-free and additive-free.
Funding Information
  • National Natural Science Foundation of China (21971092, 21901014, 21472072, 21871018, 21732001)
  • Shenzhen Science and Technology Innovation Committee (JCYJ20170818114529521)
  • FRFCU (lzujbky-2019-50, lzujbky-2017-90)
  • Program for Changjiang Scholars and Innovative Research Team in University (IRT_15R28)