[EN] PREPARATION OF (1-OXA- OR l-THIA-)3- CEPHEM DERIVATIVES [FR] PROCÉDÉ DE PRÉPARATION DE DÉRIVÉS DE (1-OXA OU 1-THIA)-3-CÉPHEM ET D'INTERMÉDIAIRES APPARENTÉS
Synthesis of thioimidates by insertion of TerT-butylisocyanide into the C-S bond of activated sulfides. Rearrangement of thioimidates by 1,3 C to N migration of an alkoxycarbonyl group
作者:G Morel、E Marchand、K.H Nguyen Thi、A Foucaud
DOI:10.1016/s0040-4020(01)91248-7
日期:1984.1
thioimidates can also be obtained via the chlorine substitution of the tert-butylimino chloro sulfides -, which is a more general method. These thioimidates rearrange to E and Z isomers of N-vinylcarbamates - via a 1,3 C to N migration of the alkoxycarbonyl group.
Liquid hydrogen chloride solvent system. XII. Reactions of some sulfur, selenium, and tellurium compounds
作者:M. E. Peach
DOI:10.1139/v69-275
日期:1969.5.15
oxidized with chlorine to dimethyl selenium dichloride and dimethyl tellurium dichloride.Methanesulfenyl chloride solution was ionized due to the protonation of sulfur, and not to the loss of a chloride ion. Methylchlorosulfonium hexafluorophosphate has been characterized. Methane- and ethane-sulfenyl chloride solutions reacted with boron trichloride giving (RSCl)2BCl3.Sulfur tetrachloride, selenium tetrachloride
tetrasubstituted alkynes. Preliminary mechanistic investigations revealed a plausible radicalprocess involving a sulfur‐centered radical intermediate via iron‐mediated homolysis of the ClS bond. The resulting chlorothiolation adducts can be readily transformed to the structurally complex alkenyl sulfides by cross‐coupling reactions. The present reaction can also be applied to the complementary synthesis of the
The present invention provides compounds of Formula (I):
1
wherein A, X, Q, Y, B, D, Z, and E have any of the values defined in the specification, and pharmaceutically acceptable salt thereof, that are useful as antidiabetic agents. Also disclosed are pharmaceutical compositions comprising one or more compounds of Formula I, processes for preparing compounds of Formula I, and intermediates useful for preparing compounds of Formula I.
(CF3)2NSCH3. The analogous reaction of trifluoromethane-sulphenyl chloride yields (CF3)2NSCF3. Fluorination of (CF3)2NSCH3 yields CH2F.SF5, which is characterized by its 19F NMR spectrum. Di(bistrifluoromethylamino) monosulphide is produced when bistrifluoromethylsulphenyl chloride is fluorinated with silver difluoride and in its reaction with silver cyanide or ethylene.