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Jennifer L. Roizen – One of the best experts on this subject based on the ideXlab platform.

  • Efficient synthesis of unsymmetrical sulfamides from sulfamic Acid Salts by activation with triphenylphosphine ditriflate
    Tetrahedron, 2019
    Co-Authors: Mina F. Shehata, Melanie A. Short, Matthew A. Sanders, Jennifer L. Roizen

    Abstract:

    Abstract A general approach to prepare unsymmetrical sulfamides is described. This method relies on the activation of sulfamic Acid Salts with triphenylphosphine ditriflate, and subsequent trapping by a nucleophilic amine. This strategy improves access to N-octadecyl-N′-propylsulfamide, a feeding suppressant.

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  • Synthesis of N-Substituted Sulfamate Esters from Sulfamic Acid Salts by Activation with Triphenylphosphine Ditriflate.
    Organic Letters, 2017
    Co-Authors: J. Miles Blackburn, Melanie A. Short, Thomas Castanheiro, Suraj K. Ayer, Tobias D. Muellers, Jennifer L. Roizen

    Abstract:

    A general approach to access sulfamate esters through preparation of sulfamic Acid Salts, subsequent activation with triphenylphosphine ditriflate, and nucleophilic trapping is disclosed. The method proceeds in modest to excellent yields to incorporate nucleophiles derived from aliphatic alcohols and phenols. This approach can be employed to furnish differentially substituted sulfamides.

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Zhaoyin Wang – One of the best experts on this subject based on the ideXlab platform.

  • A mild and efficient new synthesis of aryl sulfones from boronic Acids and sulfinic Acid Salts
    Tetrahedron Letters, 2004
    Co-Authors: Christian Beaulieu, Zhaoyin Wang, Daniel Guay, David A. Evans

    Abstract:

    A new efficient and mild preparation of sulfones from boronic Acids and sulfinic Acid Salts is reported. The cross-coupling reaction mediated by cupric acetate gives access to a variety of sulfones in excellent yield.

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  • An efficient copper catalyst for the formation of sulfones from sulfinic Acid Salts and aryl iodides.
    Organic letters, 2002
    Co-Authors: Jeremy M. Baskin, Zhaoyin Wang

    Abstract:

    A novel copper-catalyzed method for the coupling of sulfinic Acid Salts and aryl iodides is described. A variety of methyl and diaryl sulfones have been formed in excellent yields.

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David Milstein – One of the best experts on this subject based on the ideXlab platform.

  • General Synthesis of Amino Acid Salts from Amino Alcohols and Basic Water Liberating H2
    Journal of the American Chemical Society, 2016
    Co-Authors: Yehoshoa Ben-david, David Milstein

    Abstract:

    An atom-economical and environmentally friendly method to transform amino alcohols to amino Acid Salts using just basic water, without the need of pre-protection or added oxidant, catalyzed by a ruthenium pincer complex, is developed. Water is the solvent, the source of the oxygen atom of the carboxylic Acid group, and the actual oxidant, with liberation of dihydrogen. Many important and useful natural and unnatural amino Acid Salts can be produced in excellent yields by applying this new method.

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  • catalytic transformation of alcohols to carboxylic Acid Salts and h2 using water as the oxygen atom source
    Nature Chemistry, 2013
    Co-Authors: Eugene Khaskin, Ekambaram Balaraman, Gregory Leitus, David Milstein

    Abstract:

    The development of a catalytic, mild and atom-economical transformation of alcohols to carboxylic Acid Salts and hydrogen gas is described. The reaction uses water as a source of oxygen, with a homogenous Ru catalyst at low (0.2 mol%) catalyst loadings in basic aqueous solution.

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  • Catalytic transformation of alcohols to carboxylic Acid Salts and H_2 using water as the oxygen atom source
    Nature Chemistry, 2013
    Co-Authors: Ekambaram Balaraman, Eugene Khaskin, Gregory Leitus, David Milstein

    Abstract:

    The oxidation of alcohols to carboxylic Acids is an important industrial reaction used in the synthesis of bulk and fine chemicals. Most current processes are performed by making use of either stoichiometric amounts of toxic oxidizing agents or the use of pressurized dioxygen. Here, we describe an alternative dehydrogenative pathway effected by water and base with the concomitant generation of hydrogen gas. A homogeneous ruthenium complex catalyses the transformation of primary alcohols to carboxylic Acid Salts at low catalyst loadings (0.2 mol%) in basic aqueous solution. A consequence of this finding could be a safer and cleaner process for the synthesis of carboxylic Acids and their derivatives at both laboratory and industrial scales. The development of a catalytic, mild and atom-economical transformation of alcohols to carboxylic Acid Salts and hydrogen gas is described. The reaction uses water as a source of oxygen, with a homogenous Ru catalyst at low (0.2 mol%) catalyst loadings in basic aqueous solution.

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