Efficient Synthesis of beta-Oxoalkyl Carbamates from Carbon Dioxide, Internal Propargylic Alcohols, and Secondary Amines Catalyzed by Silver Salts and DBU

[摘要]：The three-component reaction of internal propargylic alcohols with secondary amines and carbon dioxide proceeded smoothly in the presence of a catalyst system comprising a silver salt and 1,8-diazabicyclo[5.4.0]undec-7-ene in 1,4-dioxane at 90 degrees C to give the corresponding beta-oxoalkyl carbamates in good to high yields. The counterion of the silver salt had little effect on the reaction whereas the nature of the organic base had a marked influence.

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