Regioselective Cobalt-Catalysed Hydrovinylation for the Synthesis of Non-Conjugated Enones and 1,4-Diketones
作者:Laura Kersten、Gerhard Hilt
DOI:10.1002/adsc.201100800
日期:2012.3.16
The highly regioselective cobalt‐catalysed 1,4‐hydrovinylation of terminal alkenes with 2‐trimethylsilyloxy‐1,3‐butadiene generates in a stereospecific fashion unsaturated E‐configured silyl enol ether intermediates that are suitable for diastereoselective Mukaiyama‐aldol reactions with bulky aliphatic aldehydes. The acidic hydrolysis of the enol ethers to γ,δ‐unsaturated ketones followed by ozonolysis
On the question of carbonyl oxide intermediates in the oxygen transfer by furan endoperoxides and bicyclic ozonides: intramolecular trapping experiments
作者:Waldemar Adam、Augusto Rodriguez
DOI:10.1016/s0040-4039(01)81944-4
日期:1981.1
the enol ester () and the bicyclic ozonide () affords instead the rearranged ozonide (). The process () → () represents an intramolecular Baeyer-Villiger rearrangement presumably via the dioxirane (D-2), while the process () → () represents intramoleculartrapping of the carbonyl oxide (C-3).