One-step synthesis of tricyclo[5.3.1.0<sup>3,8</sup>]undecan-4,11-diones by three consecutive Michael reactions. A formal synthesis of (±)-seychellene
作者:Hisahiro Hagiwara、Akihiro Okano、Hisashi Uda
DOI:10.1039/c39850001047
日期:——
Divinylketone and the trimethylsily enol ethers of cyclohex-2-en-1-ones undergo Lewis acid assisted triple Michaelreactions yielding tricyclo[5.3.1.03,8]undecan-4,11-diones; the application of this reaction enabled a formalsynthesis of (±)-seychellene (5).
Reaction of chloromethylcarbene with trimethylsilyl enol ethers. Synthesis of eucarvone, (±)-nuciferal and (±)-manicone.
作者:L. Blanco、N. Slougui、G. Rousseau、J.M. Conia
DOI:10.1016/s0040-4039(01)92512-2
日期:1981.1
New synthesis of Eucarvone , (±)-Nuciferal and (±)-Manicone are described from trimethylsilylenolethers , and via their chloromethylenation products by means of a two carbons homologation reaction.
Photoinduced electron transfer (PET) reactions from triethylamine (TEA) to ketones have been utilized for a clean and efficient route to bicyclo[3.2.1]octanones. A one-pot conversion of bicyclo[2.2.2]octenones to such molecules has been described. MeOH as well as acetonitrile/LiClO4 combinations have been found to be the most effective solvents for these reactions.
Face-Selective Diels−Alder Reactions between Unsymmetrical Cyclohexadienes and Symmetric <i>trans</i>-Dienophile: An Experimental and Computational Investigation
作者:Saswati Lahiri、Somnath Yadav、Srirupa Banerjee、Mahendra P. Patil、Raghavan B. Sunoj
DOI:10.1021/jo701884d
日期:2008.1.1
functional theory studies with the mPW1PW91/6-31G* as well as the B3LYP/6-31G* levels reveal that the electrostatic repulsion between the oxygen lone pairs on the diene and the dienophile is critical to the observed product selectivities. The optimized transition state geometries though appeared to involve secondaryorbital interactions, careful examination of the frontier Kohn−Sham orbitals as well as calculations