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Abstract:The one-pot conversion of a mercaptan and an aryl methanesulfonate into a trithioorthoformate is described.

Synthesis of Functionalized Azomethine Ylides via the Rh(II)-Catalyzed Cyclization of α-Diazo Carbonyls onto Imino π-Bonds. -On the basis of a variety of reactions is shown that α-diazo carbonyl compounds containing an imino group in the γ-position undergo Rh(II)-catalyzed cyclization to produce azomethine ylides. Cycloaddition of these dipoles with different dipolarophiles such as ( II), (VII) and N-phenylmaleimide affords cycloadducts in good yields. The cyclization reaction is markedly dependent on the geometry about the imino π-bond (necessary E-configuration) as well as the basicity of the electron pair on the N-atom (e.g. no cyclization of aromatic isoxazole analogues of (X)). -(PADWA, A.; DEAN, D. C.; OSTERHOUT, M. H.; PRECEDO, L.; SEMONES, M. A.; J.