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In the title compound, C15H13NOS, the thia­zine ring adopts a twisted boat conformation and the dihedral angle between the aromatic rings is 86.54 (4)°. In the crystal, mol­ecules are linked by weak C—H⋯O inter­actions, resulting in chains along [010].

The crystal structure of the title ester, ethyl 5-methyl-1,2,4-triazolo[ 1,5-a]pyrimidine-7-acetate, C10H12N402, is described. In the field of heterocyclic chemistry, the prospects offered for the design of antiviral agents, as well as the chemistry of interaction of N-bridged purine analogue ligands with heavy

A short synthesis of new, functionalized seven‐membered ring cyclic dipeptides is described. After the coupling of N‐protected β‐amino acids to N‐substituted α‐amino tert‐butyl esters, the protective groups of the terminal functions were removed and the cyclization took place diastereoselectively in the presence of the coupling agent BOP. Amide substitution was found to be effective in promoting the cyclization of linear dipeptides.

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