Palladium-catalyzed cyclization of alkenyl β-keto esters in the presence of chlorotrimethylsilaneElectronic supplementary information (ESI) available: experimental procedures, analytical and spectroscopic data for new compounds and cyclohexanones. See http://www.rsc.org/suppdata/cc/b1/b111644d/
作者:Tao Pei、Ross A. Widenhoefer
DOI:10.1039/b111644d
日期:2002.3.7
PdCl2(CH3CN)2 catalyzed the cyclization of alkenyl beta-keto esters in the presence of a stoichiometric amount of SiMe3Cl to form 2-carboalkoxycyclohexanones in good yield with excellent regioselectivity.
Dialkyl amides of L-valine, L-isoleucine, and L-tert-leucine (2) are excellent chiral auxiliaries for the construction of quaternary stereocenters at ambient temperature. Enaminoesters 3, prepared from these auxiliaries 2 and Michael donors 1, undergo a copper-catalyzed asymmetricMichaelreaction with methyl vinyl ketone (MVK, 4) to afford products 5 in 70-90% yield and 90-99% ee (enantiomeric excess)
Studies on diastereoselective reduction of cyclic β-ketoesters with boron hydrides. Part 4: The reductive profile of functionalized cyclohexanone derivatives
作者:Carlos A.M Fraga、Lis Helena P Teixeira、Carla Maria de S Menezes、Carlos Mauricio R Sant'Anna、Maria da Conceição K.V Ramos、Francisco R.de Aquino Neto、Eliezer J Barreiro
DOI:10.1016/j.tet.2004.01.079
日期:2004.3
Reduction of 2-allyl-2-carboalkoxycyclohexanones (3d-f), 2-propyl-2-carboethoxycyclohexanone (3g) and 2-benzyl-2-carboethoxycyclohexanone (3h) with boron hydrides in the presence and absence of several chelating agents were studied. Molecular modeling studies using semiempirical PM3 method were performed in order to find a suitable explanation of the diastereoselection of ketone carbonyl faces during