A mild, practical, and simple procedure for phenyl selenoesters synthesisfrom several anhydrides and diphenyl diselenide was developed. This transition-metal-free method provides a straightforward entry to storable Fmoc-amino acid selenoesters which are effective chemoselective acylating reagents. An application to oligopeptide synthesis was illustrated.
Herein, we report an eco-friendly synthesis of selenoesters from acyl chlorides catalyzed by recyclable CuO nanopowder in ionic liquid as a recyclable solvent in good to excellent yields. This protocol shows high efficiency in catalyzing this transformation in a greener fashion than previous protocols due to the non-residual methodological design.
reactivity and hydrolytic stability. Their homobifunctional cross-linkers were prepared to conjugate proteins with small molecules, including carbohydrates, fluorescent dyes, and poly(ethylene glycol) monomethyl ether. The conjugations proceeded under mild conditions, affording the corresponding protein conjugates with good efficiency.
Fully reversible carbon protonation in the hydrolysis of keten selenoacetals
作者:Henri Wautier、St�phane Desauvage、Laszlo Hevesi
DOI:10.1039/c39810000738
日期:——
Kinetic solvent isotope effect [k(H3O+)/k(D3O+)<1] and deuterium incorporation (ca. 100%) during acidic hydrolysis of keten selenoacetals establish that these reactions proceed through a pre-equilibrium carbonprotonation step.
酮型硒缩醛的酸性水解过程中的动力学溶剂同位素效应[ k(H 3 O +)/ k(D 3 O +)<1]和氘的掺入(约100%)确定了这些反应通过平衡前的碳质子化进行步。
Reaction of diazomethane with selenoesters
作者:Thomas G. Back、Russell G. Kerr
DOI:10.1016/s0040-4020(01)96714-6
日期:1985.1
selenoesters 1c and 1i with diazomethane resulted in crossover, with the formation of all four possible α-seleno ketones 2b, 2c, 2h and 2i. A non-concerted mechanism involving attack by the diazo compound upon the acyl carbon atom of an activated selenoester with the formation of a tetrahedral intermediate 11 has been suggested. The reaction of the selenothiocarbamate 4 with diazomethane resulted in 1,3-dipolar