26770-99-0Relevant articles and documents
Novel synthesis of (d,l) trans-chrysanthemic acid involving a β-diketone fragmentation
Krief, Alain,Jeanmart, Stephane
, p. 6167 - 6168 (2007/10/03)
Methyl (d,l) trans-chrysanthemate as well as its cis-diastereoisomer have been prepared from dimethyl dimedone, one of their isomers, in a few steps and with complete control of the relative stereochemistry.
PSEUDOESTERES Y DERIVADOS XXXIII. SINTESIS DE COMPUESTOS CICLOPROPANICOS POR FOTOLISIS DE PIRAZOLINAS OBTENIDAS POR CICLOADICION 1,3-DIPOLAR A LA 5-METOXI-2(5H)-FURANONA
Farina, F.,Martin, M. V.,Soria, M. L.
, p. 65 - 73 (2007/10/02)
By cycloaddition of 2-diazopropane to 5-methoxy-2(5H)-furanone (1) two regioisomeric 1-pyrazolines 3 and 4 are stereospecifically obtained.Both isomers give by photolysis, as major or sole compound, the same cyclopropane derivative 7.Hydrolysis of the bicyclic compound 7, followed by esterification, leads to cis open chain derivatives, which are appropiately functionalized for the synthesis of pyrethroids. a similar set of reactions, using diazomethane-d2 as dipolarophile, affords selectively deuterated cyclopropane derivatives.Palabras clave: Cicloadicion 1,3-dipolar, pirazolinas, fotolisis, ciclopropanos, piretroides.
ALLYLIC STEREOCENTRE DIRECTED CYCLOPROPANATION. A NEW HIGHLY ENANTIOSELECTIVE SYNTHESIS OF HEMICARONIC ALDEHYDE
Bernardi, Anna,Scolastico, Carlo,Villa, Roberto
, p. 3733 - 3734 (2007/10/02)
isopropyledenetriphenylphosphorane reacts with oxazolidine 4 with excellent ?-face selectivity.The title compound is obtained in high optical purity after removal of the chiral auxiliary.
A SYNTHESIS OF TRANS- AND CIS-CARONALDEHYDES
Takano, Seiichi,Sato, Nobuaki,Akiyama, Masashi,Ogasawara, Kunio
, p. 2859 - 2872 (2007/10/02)
A preparation of trans- and cis-caronaldehyde derivatives is described by employing iodolactonization reaction as a key step.Investigation is also carried out to establish an asymmetric synthesis by employing the same methodology which allows diastereoselective formation of optically active intermediates in both enantiomeric forms from a single precursor though the degree of asymmetric induction is found to be less satisfactory.
SYNTHESE STEREO ET ENANTIOSELECTIVE PAR L'INTERMEDIAIRE DE COMPLEXES DU FER DE DERIVES CHRYSANTHEMIQUES DIENIQUES ET D'ALDEHYDES HEMICARONIQUES CIS ET TRANS.
Franck-Neumann, M.,Martina, D.,Heitz, M. P.
, p. 3493 - 3496 (2007/10/02)
A stereo and enantioselective synthesis of cis and trans hemicaronic aldehydes, starting from the optically active sorbic aldehyde-irontricarbonyl complex, is described.