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Síntesis de aminas secundarias por transferencia mediada por titanio de grupos alquenilo de los alcoholes
Balasubramanian Ramanathan1, Aaron L Odom
1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
Journal of the American Chemical Society
|July 20, 2006
Resumen
Los complejos de amida de titanio facilitan la transferencia selectiva de alelo de los alcoholes a las aminas, formando aminas alilicas secundarias a través de un mecanismo de cicloadición propuesto. Este método también permite la síntesis de aminas espirocíclicas complejas a partir de alcoholes homoalílicos.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química orgánica sintética y orgánica.
- La catálisis es la catálisis.
Sus antecedentes:
- Las amidas de titanio son reactivos versátiles en la síntesis orgánica.
- Las reacciones de transferencia de alelos son cruciales para la formación de enlaces carbono-carbono y carbono-heteroatomo.
- El desarrollo de metodologías sintéticas selectivas y eficientes es un objetivo clave en química.
Objetivo del estudio:
- Para investigar la reacción del tetráquido de titanio (dimetilamida) (Ti (NMe2) 4) con los alcoholes aliloides y aminas primarias.
- Para explorar el mecanismo de la transferencia de alelo y la transposición de alelo.
- Examinar la aplicación de esta metodología con alcoholes homoalílicos para la síntesis de moléculas complejas.
Principales métodos:
- Reacción de Ti(NMe2)4 con varios alcoholes aleloides y aminas primarias.
- Análisis de los productos de reacción para determinar la selectividad y la estereoquímica.
- Estudios mecanicistas que involucran efectos sustituyentes para dilucidar las vías de reacción.
- Investigación de las reacciones con alcoholes homoalílicos.
Principales resultados:
- Formación selectiva de aminas alilicas secundarias a través de la transferencia de alilo de los alcoholes a las aminas.
- Observación de la transposición alelica selectiva durante el proceso de transferencia.
- Postulación de un mecanismo de adición de ciclo [2 + 2]/retro- [2 + 2] basado en los efectos de los sustituyentes.
- Síntesis exitosa de 1-aza-spiro[5.5]undecano con el uso de alcoholes homoalílicos.
Conclusiones:
- Ti(NMe2) 4 es un reactivo eficaz para la transferencia selectiva de alelos a aminas.
- La reacción procede a través de un mecanismo de cicloadición propuesto, lo que demuestra la transposición de alelo.
- La metodología puede extenderse a los alcoholes homoalílicos para la síntesis de estructuras espirocíclicas complejas.
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