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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
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A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
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In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
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Rh ((III) - Catalisado Regiodivergente (Hetero) Arilamidación de los Sulfuros Alilicos (Homo)

Xiaoyan Jia1, Gui-Lin Hao2, Mengxia Feng1

  • 1State Key Laboratory of Pulp and Paper Engineering and Key Laboratory of Functional Molecular Engineering of Guangdong Province in School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China.

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Resumen
Este resumen es generado por máquina.

Este estudio introduce una reacción catalizada por el rodio para la arylamidación de sulfuros alílicos, creando valiosos compuestos N, S. El método ofrece una alta selectividad y control sobre los estereocentros.

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Área de la Ciencia:

  • Química orgánica
  • Catálisis
  • Metodología sintética

Sus antecedentes:

  • Los sulfuros alílicos son productos intermedios sintéticos muy versátiles.
  • El desarrollo de métodos enantioselectivos para la síntesis de N-heterociclos es crucial.
  • La catálisis de rodio ofrece una reactividad única para la formación de enlaces C-N.

Objetivo del estudio:

  • Desarrollar una nueva reacción de 3 componentes catalizada por rodio para la arilamidación.
  • Para lograr la síntesis diastereoselectiva y regioselectiva de los compuestos 1,3-N,S.
  • Para permitir la arylamidación enantioselectiva de los sulfuros alílicos.

Principales métodos:

  • Reacción de acoplamiento de tres componentes catalizada por el rodio.
  • Utilizando sulfuros alílicos, ácidos organobóricos y dioxazolonas.
  • Optimización de las condiciones de reacción para el rendimiento y la selectividad.

Principales resultados:

  • Exitosa arylamidación de los sulfuros aliloides y homoaliloides.
  • Formación de productos de inserción 1,2 y 2,1.
  • Se obtienen altos rendimientos y una excelente diastereoselectividad y enantioselectividad para los compuestos 1,3-N,S.

Conclusiones:

  • El método desarrollado proporciona un acceso eficiente a compuestos complejos de 1,3-N,S.
  • El grupo sulfuro juega un papel clave en la modulación de las etapas catalíticas.
  • Este trabajo amplía el alcance de la formación de enlaces C-N catalizados por rodio.