Transition metal-free, base mediated one-pot approach for the construction of the benzo[b][1,4,5]oxathiazepine 1-oxide core

Protocol for synthesising selected separable diastereomers of benzo[ b ][1,4,5]oxathiazepine 1-oxides via intermolecular epoxide ring opening by o -halogenated NH-sulfoximine followed by cyclisation and configurations were assigned by 2D NMR and X-ray crystallography.