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Bifunctional N (bifunctional + n)
Selected AbstractsAsymmetric Strecker Reaction of Ketoimines Catalyzed by a Novel Chiral Bifunctional N,N, -DioxideADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 18 2006Xiao Huang Abstract A novel bifunctional N,N, -dioxide derived from L -prolinamide was employed to catalyze the enantioselective Strecker reaction of a range of N -tosyl ketoimines, and an effective additive was used to improve the reactivity (up to 99,% yield) as well as the enantioselectivity (up to 91,% ee). In addition, a rational transition state was proposed to elucidate the origin of chiral induction in which an S -adduct was produced. [source] Asymmetric [3+2] Cycloadditions of Allenoates and Dual Activated Olefins Catalyzed by Simple Bifunctional N -Acyl Aminophosphines,ANGEWANDTE CHEMIE, Issue 26 2010Hua Xiao Einfach und difunktionell sind N -Acylaminophosphan-Katalysatoren wie 1 für die ersten asymmetrischen [3+2]-Cycloadditionen zwischen Allenoaten und doppelt aktivierten Olefinen. Die Cycloadditionen ergeben hoch funktionalisierte chirale Cyclopentene mit strikter Regioselektivität sowie guten bis hervorragenden Enantioselektivitäten und Ausbeuten. [source] ChemInform Abstract: Synthesis, Evaluation and Application of Novel Bifunctional N,N-Di-isopropylbenzylamineboronic Acid Catalysts for Direct Amide Formation Between Carboxylic Acids and Amines.CHEMINFORM, Issue 24 2008Kenny Arnold Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a "Full Text" option. The original article is trackable via the "References" option. [source] Asymmetric Strecker Reaction of Ketoimines Catalyzed by a Novel Chiral Bifunctional N,N, -DioxideADVANCED SYNTHESIS & CATALYSIS (PREVIOUSLY: JOURNAL FUER PRAKTISCHE CHEMIE), Issue 18 2006Xiao Huang Abstract A novel bifunctional N,N, -dioxide derived from L -prolinamide was employed to catalyze the enantioselective Strecker reaction of a range of N -tosyl ketoimines, and an effective additive was used to improve the reactivity (up to 99,% yield) as well as the enantioselectivity (up to 91,% ee). In addition, a rational transition state was proposed to elucidate the origin of chiral induction in which an S -adduct was produced. [source] Expression, crystallization and preliminary crystallographic studies of a novel bifunctional N -acetylglutamate synthase/kinase from Xanthomonas campestris homologous to vertebrate N -acetylglutamate synthaseACTA CRYSTALLOGRAPHICA SECTION F (ELECTRONIC), Issue 12 2006Dashuang Shi A novel N -acetylglutamate synthase/kinase bifunctional enzyme of arginine biosynthesis that was homologous to vertebrate N -acetylglutamate synthases was identified in Xanthomonas campestris. The protein was overexpressed, purified and crystallized. The crystals belong to the hexagonal space group P6222, with unit-cell parameters a = b = 134.60, c = 192.11,Å, and diffract to about 3.0,Å resolution. Selenomethionine-substituted recombinant protein was produced and selenomethionine substitution was verified by mass spectroscopy. Multiple anomalous dispersion (MAD) data were collected at three wavelengths at SER-CAT, Advanced Photon Source, Argonne National Laboratory. Structure determination is under way using the MAD phasing method. [source] | ||||||||||