Electrooxidative cleavage of carbon-carbon bonds. 2. Double cleavage of .alpha.,.beta.-epoxy alkanones and enantiospecific syntheses of chiral methyl trans- and cis-chrysanthemates from (+)- and (-)-carvones
The first enantiospecific total synthesis of (+)-seychellene
作者:A. Srikrishna、G. Ravi、G. Satyanarayana
DOI:10.1016/j.tetlet.2006.11.011
日期:2007.1
The first enantiospecific total synthesis of the tricyclic sesquiterpene (+)-seychellene, starting from (R)-carvone via (S)-3-methylcarvone, has been accomplished employing a combination of an intermolecular Michael addition–intramolecular Michael addition sequence and an intramolecular alkylation reaction for the generation of the two vicinalquaternarycarbonatoms.
Synthesis of chiral bicyclo[4.3.1]decanes via an intramolecular carbonyl ene-reaction
作者:A. Srikrishna、C. Dinesh、K. Anebouselvy
DOI:10.1016/s0040-4039(98)02518-0
日期:1999.1
Synthesis of chiral bicyclo[4.3.1]decanes via an intramolecular acid catalysed type II ene reaction of chiral (5-isopropenylcyclohex-2-enyl)acetaldehydes derived from (R)-carvone is described.
Lewis acid-catalyzed oxidative rearrangement of tertiary allylic alcohols mediated by TEMPO
作者:Jean-Michel Vatèle
DOI:10.1016/j.tet.2009.11.104
日期:2010.1
Two methods for the oxidative rearrangement of tertiary allylic alcohols have been developed. Most of tertiary allylic alcohols studied were oxidized to their corresponding transposed carbonyl derivatives in excellent to fair yields by reaction with TEMPO in combination with PhIO and Bi(OTf)3 or copper (II) chloride in the presence or not of oxygen. Other primary oxidants of TEMPO such as PhI(OAc)2
Copper-Catalyzed Aerobic Oxidative Rearrangement of Tertiary Allylic Alcohols Mediated by TEMPO
作者:Jean-Michel Vatèle
DOI:10.1055/s-0029-1217545
日期:2009.8
A mild method for the oxidativerearrangement of tertiary allylic alcohols to β-substituted enones using a TEMPO/CuCl 2 system, in the presence of molecular sieves, is described. Depending on the substrate, CuCl 2 was used in either a catalytic amount under an oxygen atmosphere or stoichiometrically.
A convenient deoxygenation of α,β-epoxy ketones to enones
作者:Reginaldo B. dos Santos、Timothy John Brocksom、Ursula Brocksom
DOI:10.1016/s0040-4039(96)02451-3
日期:1997.2
A new and efficient methodology for the deoxygenation of α,β-epoxyketones to enones has been developed, using aminoiminomethanesulfinic acid (thiourea dioxide) as the reducing agent under phase transfer conditions. The epoxides of mesityl oxide, isophorone, (−)-carvone, (+)-6-methyl-carvone, (+)-6-ethyl-carvone and (−)-myrtenal, were converted into their respectives enones in good to excellent yields