An asymmetric gold(I)-catalyzed [3+2] cycloaddition of propargyl acetals/ketals and aldehydes is reported, which proceeds via stepwise migration-fragmentation of acetals/ketals and cycloaddition of the in situ generated gold-carbenoid intermediate. Various functionalized 2, 5-dihydrofurans were obtained in good yields and high enantioselectivities. Furthermore, an example of the first gold(I) c...

Key words iridium catalysis - chiral phosphoric acid photocatalyst 2+2 cycloaddition

Photoaffinity labeling with bovine rhodopsin using a retinal with a fixed 11-cis-ene cross-linked exclusively to Trp-265/Leu-266 in helix F, showing that the beta-ionone C-3 is close to helix F. Moreover, since these labeled amino acids are in the middle of helix F, while the Schiff-base linkage to Lys-296 at the other terminus of the chromophore is also in the middle of helix G, the chromophor...

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We determined the effects of a commonly used mosquito (Culicidae) larvicide (Califor­ nia Golden Bear Oil�, also GB-1111) on body mass and survival of mallard (Anas platyrhynchos) ducklings and on target and nontarget invertebrates. Field studies con­ ducted on natural ponds located in salt marshes in south San Francisco Bay indicated that GB-1111 had an initial impact on potential invertebrate...

Isosorbide was esterified with acryloyl chloride and crotonic acid yielding isosorbide diacrylate (9a) and isosorbide dicrotonate (9b), which were reacted with benzaldehyde oxime in the presence of zinc(II) iodide and boron triflouride etherate as catalysts to obtain N-alkylated dinitrones 10a/b. Poly(isosorbide itaconite -co- succinate) 13 as a bio-based unsaturated polyester was cross-linked ...

Cubic, octahedral, and rhombic dodecahedral Cu2O nanocrystals bound by respectively {100}, {111}, and {110} facets were successfully employed to catalyze the [3 + 2] cycloaddition reaction for the regioselective synthesis of 3,5-disubstituted isoxazoles. Surfactant-free nanocrystals having the same total surface area were used for the catalysis. Strongly facet-dependent organocatalytic activity...

Introduction: Due to the interesting pharmacological properties of radiolabeled metal oxine derivatives such as cell internalization, tumor avidity and antiproteosome activity, 111In-tris[8-Hydroxy-2-methylquinoline] (111In-HMQ) was developed in this study. Methods: 111In-HMQ was prepared using 111InCl3 and 8-Hydroxy-2-methylquinoline (HMQ) ...

The 1,2,3-triazole is a well-known biologically active pharmacophore constructed by the copper-catalyzed azide–alkyne cycloaddition. We herein reported synthesis of 4-amino-7-chloro-based [1,2,3]-triazole hybrids via Cu(I)-catalyzed Huisgen 1,3-dipolar cycloaddition 4-azido-7-chloroquinoline with an alkyne derivative acetaminophen. compound was fully characterized Fourier-transform infrared (FT...