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[摘要]：The stereoselective transformation of 2-thioamides to 2-thio-3-chloroacrylamides and the investigation of the scope of this transformation, including extension to ester and nitrile derivatives, is described. These highly functionalised acrylamide derivatives are synthetically versatile, and their reactivity has been investigated in a wide range of transformations, including chemoselective oxidation to the racemic sulfoxide or sulfone, and enantioselective and diastereoselective oxidation to the sulfoxides. The 2-thio-3-chloroacrylamides were found to be very effective Michael acceptors in nucleophilic addition/substitution reactions, dienophiles in Diels-Alder cycloadditions, and dipolarophiles in 1,3-dipolar cycloadditions. The level of oxidation at sulfur was found to strongly influence the reactivity. This account summarises synthetic and mechanistic aspects of the research programme focussed on the synthesis and reactivity of 2-thio-3-chloroacrylamides in our research group over the past decade. |
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