Video Experimental Relacionado
Updated: Jul 6, 2026

11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
Síntesis total de la UCS1025A en su totalidad
Tristan H Lambert1, Samuel J Danishefsky
1Laboratory for Bioorganic Chemistry, Sloan-Kettering Institute for Cancer Research, New York, New York 10021, USA.
Journal of the American Chemical Society
|January 13, 2006
Resumen
Se logró la síntesis total del inhibidor de la telomerasa UCS1025A. Se empleó una reacción de acoplamiento Reformatsky de boro clave para esta síntesis enantioselectiva.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- Química Medicinal La Química Medicinal es el campo de la Química Medicinal.
Sus antecedentes:
- La telomerasa es un objetivo clave para la terapia del cáncer.
- UCS1025A es un potente inhibidor de la telomerasa.
Objetivo del estudio:
- Para lograr la síntesis total enantioselectiva de UCS1025A.A.
Principales métodos:
- Reacción de acoplamiento Reformatsky de boro. reacción de acoplamiento Reformatsky de boro.
- Síntesis de iodolactona 13 y aldehído 17.
Principales resultados:
- El éxito de la síntesis total enantioselectiva de UCS1025A.A.
- Demostración de un acoplamiento Reformatsky de boro y boro clave.
Conclusiones:
- La síntesis proporciona una ruta viable hacia UCS1025A.
- El acoplamiento de boro Reformatsky es una herramienta poderosa para la síntesis de moléculas complejas.
Videos de Conceptos Relacionados
Assembly of Signaling Complexes
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
LC Circuits
An LC circuit consists of an inductor and a capacitor, either in series or parallel. Consider a charged capacitor connected with an inductor in series. Before the switch is closed, all the energy of the circuit is stored in the electric field of the capacitor. When the switch is closed, the capacitor begins to discharge, producing a current in the circuit. The current, in turn, creates a magnetic field in the inductor. Because of the induced emf in the inductor, the current cannot change...
Integrator and Differentiator
Op-amp circuits have significant applications in various fields, including automotive engineering. One such application is cruise control systems in cars, where op-amp circuits are integral for maintaining a constant speed. In these systems, op-amps function as both integrators and differentiators.
An integrator within an op-amp circuit produces an output directly proportional to the integral of the input signal. This is achieved by replacing the feedback resistor in a typical inverting...
An integrator within an op-amp circuit produces an output directly proportional to the integral of the input signal. This is achieved by replacing the feedback resistor in a typical inverting...
Cascaded Op Amps
Operational amplifiers (op-amps) are versatile electronic components that can be interconnected in a cascade - one after another in a linear sequence. This cascading is possible due to their infinite input resistance and zero output resistance, allowing them to maintain their input-output relationships even when connected in series.
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
In a cascaded system, each op-amp is referred to as a stage. The output of one stage drives the input of the subsequent stage. As the input signal passes through...
Design Example: Capacitance Multiplier Circuit
In integrated circuit technology, a capacitance multiplier is often utilized to produce a larger capacitance value when a small physical capacitance falls short. This is achieved by a circuit that multiplies capacitance values by a factor of up to 1000, such that a 10-pF capacitor can replicate the performance of a 100-nF capacitor.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
The circuit illustrated in Figure 1 below incorporates two op-amps, with the first operating as a voltage follower and the second acting as an inverting amplifier.
Bus Impedance Matrix
Calculating subtransient fault currents for three-phase faults in an N-bus power system involves using the positive-sequence network. When a three-phase short circuit occurs at a specific bus, the analysis uses the superposition method to evaluate two separate circuits.
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...
In the first circuit, all machine voltage sources are short-circuited, leaving only the prefault voltage source at the fault location. The positive-sequence bus impedance matrix can be determined by solving the nodal equations,...

