Lanthanide‐catalyzed alkynyl exchange through C−C single‐bondcleavage assisted by a secondary amino group is reported. A lanthanide amido complex is proposed as a key intermediate, which undergoes unprecedented reversible β‐alkynyl elimination followed by alkynyl exchange and imine reinsertion. The in situ homo‐ and cross‐dimerization of the liberated alkyne can serve as an additional driving force
Synthesis of Oxazolidinones by Efficient Fixation of Atmospheric CO<sub>2</sub>with Propargylic Amines by using a Silver/1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) Dual-Catalyst System
This'll fix it: Efficientfixation of atmospheric CO2 has been achieved by the reaction of propargylicamines with a silver/DBU dual‐catalyst system (see scheme). Various oxazolidinones were synthesized in moderate to good yields by using substituted propargylicamines.
Cationic Pd(II)-Catalyzed Reductive Cyclization of Alkyne-Tethered Ketones or Aldehydes Using Ethanol as Hydrogen Source
作者:Kun Shen、Xiuling Han、Xiyan Lu
DOI:10.1021/ol400531a
日期:2013.4.5
A cationic Pd(II)-catalyzed reductivecyclization of alkyne-tethered ketones or aldehydes usingethanol as hydrogensource under mild conditions was developed. The reaction is an environmentally benign synthetic method and proceeds efficiently to give useful N-heterocycles or carbocycles bearing an exocyclic double bond and a hydroxyl group in high yield.