Direct preparation of substituted olefins from epoxides utilizing lithium tetraalkylcerate
作者:Yutaka Ukaji、Tamotsu Fujisawa
DOI:10.1016/s0040-4039(00)80709-1
日期:1988.1
Alkylated olefins were directly synthesized in good yields by the deoxygenation reaction of epoxides with concomitant introduction of the alkyl group using lithium tetraalkylcerate. Styreneoxide and (1-naphthyl)ethyleneoxide gave terminal olefins, while ethyleneoxide replaced by aliphatic substituent, 1,2-epoxy-4-phenyl butane, afforded internal olefin. The utility of the present method was demonstrated
Ru-Catalyzed Decarbonylative Addition of Aliphatic Aldehydes to Terminal Alkynes
作者:Xiangyu Guo、Jun Wang、Chao-Jun Li
DOI:10.1021/ol101107w
日期:2010.7.16
A novel method for the formation of isolated C=C bonds was developed via a ruthenium-catalyzed decarbonylative addition of aliphatic aldehydes and alkynes. An unprecedented complete switch of chemoselectivity from aromatic aldehydes to aliphatic aldehydes was observed simply by using tri(2,4,6-trismethoxyphenyl)phosphine as ligand. A synthesis by this method of an insect sex pheromone was demonstrated.
Carbonyl cross-metathesis via deoxygenative gem-di-metal catalysis
作者:Lumin Zhang、David A. Nagib
DOI:10.1038/s41557-023-01333-8
日期:2024.1
Carbonyls and alkenes are versatile functional groups, whose reactivities are cornerstones of organic synthesis. The selective combination of two carbonyls to form an alkene—a carbonyl cross-metathesis—would be a valuable tool for their exchange. Yet, this important synthetic challenge remains unsolved. Although alkene/alkene and alkene/carbonyl cross-metathesisreactions are known, there is a lack