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Connor Yap Dr. Gabriel M. J. Lenagh-Snow Dr. Somnath Narayan Karad Dr. William Lewis Dr. Louis J. Diorazio Prof. Hon Wai Lam 《Angewandte Chemie (International ed. in English)》2017,56(28):8216-8220
Enantioselective nickel-catalyzed arylative cyclizations of substrates containing a Z-allylic phosphate tethered to an alkyne are described. These reactions give multisubstituted chiral aza- and carbocycles, and are initiated by the addition of an arylboronic acid to the alkyne, followed by cyclization of the resulting alkenylnickel species onto the allylic phosphate. The reversible E/Z isomerization of the alkenylnickel species is essential for the success of the reactions. 相似文献
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Lenagh-Snow GM Araújo N Jenkinson SF Martínez RF Shimada Y Yu CY Kato A Fleet GW 《Organic letters》2012,14(8):2142-2145
Primary amines with either 3,5-di-O-ditriflates of α-furanosides or 2,4-di-O-triflates of β-pyranosides form bicyclic azetidines in high yield. 相似文献
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Lenagh-Snow GM Jenkinson SF Newberry SJ Kato A Nakagawa S Adachi I Wormald MR Yoshihara A Morimoto K Akimitsu K Izumori K Fleet GW 《Organic letters》2012,14(8):2050-2053
Although there are 32 6-azidoheptitols, there are only 16 homonojirimycin (HNJ) stereoisomers. Two epimeric azidoalditols derived from d-mannose allow the synthesis in water of eight stereoisomers of HNJ. 相似文献
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Lenagh-Snow GM Araujo N Jenkinson SF Rutherford C Nakagawa S Kato A Yu CY Weymouth-Wilson AC Fleet GW 《Organic letters》2011,13(21):5834-5837
Efficient ring closure of stable crystalline 3,5-di-O-triflates of pentofuranosides with amines to form azetidines allowed preliminary evaluation of four-ring iminosugars as glycosidase inhibitors; significant and specific inhibition of nonmammalian α-glucosidases is shown by L-xylo- and L-arabino-iminosugar azetidines. 相似文献
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The adsorption isotherms at 25, 45, and 65 degrees C of molybdenum solutions of concentration ranges between 10(-3) and 3x10(-2) M(Mo) (pH 4-5) on different alumina samples are investigated. The analysis is conducted using a modified Frumkin isotherm which takes a more realistic account of the lateral interaction between adsorbed species and considers that the adsorption takes place on the most basic OH groups on the surface of alumina. The results are discussed in view of the difference in solutions speciation, and the changes in the pH of the remaining supernatant solutions. The solution temperature, PZC of the used aluminas, the configuration of the basic OH groups on their surface, and the pore structure have been shown to intervene effectively. Copyright 2000 Academic Press. 相似文献
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