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The ring-closing enyne metathesis reaction of alkyl 2-substituted-2-(N-alkynyl acrylamido)esters using the first-generation Grubbs’ catalyst afforded five-membered lactams bearing a 1,3-diene moiety in high isolated yields. In the reaction process, the presence of ethylene gas is essential.
An operationally trivial and environmentally benign procedure for direct Michael addition has been developed. The reaction of various ketones with nitroolefins can be performed in water to afford the corresponding nitro compounds in high yields in the presence of a pyrrolidine–thiourea organocatalyst at 35°C. The reaction exhibits a high stereoselectivity, with high enantioselectivities (up to 99%)...
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