Indium Trichloride-Catalyzed Conjugate Addition of Amines to <i>α</i>,<i>β</i>-Ethylenic Compounds in Water
作者:Teck-Peng Loh、Lin-Li Wei
DOI:10.1055/s-1998-1845
日期:1998.9
Catalytic amount of indium (III) trichloride efficiently catalyzed Michael reaction between amines and α,β-ethylenic compounds in water and under mild conditions. Indium trichloride can be recovered and reused without decrease in yield.
Tandem Protocol for the Stereoselective Synthesis of Different Polyfunctional β-Amino Acids and 3-Amino-Substituted Carbohydrates
作者:Norbert Sewald、Klaus D. Hiller、Matthias Körner、Matthias Findeisen
DOI:10.1021/jo980656z
日期:1998.10.1
Conjugateaddition of homochiral amidocuprates or lithium amides based on (R)-N-(1-phenylethyl)(trimethylsilyl)amine to alpha,beta-unsaturated esters proceeds stereoselectively and allows the synthesis of beta-amino acids. Trapping of the intermediate ester enolate with D(2)O affords the corresponding deuterated compounds. anti-alpha-Alkyl-beta-amino acids are obtained stereoselectively after transmetalation
Diastereoselective syntheses of 3-aryl-5-(arylalkyl)-6-methyl-1-(1-phenylethyl)thioxotetrahydropyrimidin-4(1H)-ones: A stereochemical perspective from endo and exocyclic chiral centres
作者:Varun Kumar、Pallepogu Raghavaiah、Shaikh M. Mobin、Vipin A. Nair
DOI:10.1039/c0ob00230e
日期:——
Diastereoselective syntheses of 3-aryl-(S/R)-6-methyl-1-[(S/R)-1-phenylethyl)]-2-thioxotetrahydro pyrimidin-4(1H)-ones were achieved in good yields by the condensation of aryl isothiocyanates with ethyl 3-(1-phenylethylamino)butanoate in a one-pot reaction. Benzylation of these substrates illustrated that the orientations of the exocylic and endocylic groups determine the stereochemical outcome of the product formed.