Resultado de búsqueda
Azomethine ylides are nitrogen-based 1,3-dipoles, consisting of an iminium ion next to a carbanion. They are used in 1,3-dipolar cycloaddition reactions to form five-membered heterocycles, including pyrrolidines and pyrrolines.
6 de feb. de 2018 · The two components of this reaction are: a carbonyl compound (aldehydes and ketones both work, but not esters or amides) a rather strange-looking species known as an ylide. (specifically, a “phosphonium ylide”, because there are also ylides of nitrogen and sulfur).
27 de ene. de 2010 · New reactions of azomethine ylides with nontraditional dipolarophiles are reported. Azomethine ylides, formed in situ via decarboxylative condensations of α-amino acids with aldehydes, undergo reactions with naphthols, indoles, alkynes, and nitroalkanes.
8 de abr. de 2019 · Here, the authors report a synergistic Cu/Ir-catalytic system that converts aldimine esters to a variety of chiral homoallylic amines via a cascade allylation/2-aza-Cope rearrangement.
28 de feb. de 2022 · A ylide is a neutral species in which there is a carbon atom bearing a formal charge of -1 bound to a heteroatom bearing a formal charge of +1. Ylides are classified based on the nature of the positively charged heteroatom.
Amides are most commonly prepared though the reaction of an acid chloride with ammonia, a 1 o amine, or 2 o amine. In an analogous reaction, an amide can be prepared through the reaction of a carboxylic acid and an amine using a coupling agent such as DCC.
6 de feb. de 2019 · Staudinger reductions of aryl azides to amines through the use of phosphines can trigger an elimination reaction, and thereby activation of a functional molecule, if an appropriately positioned...
