Producción Científica Profesorado

Preparation of Seven- and Eight-Membered Boron Heterocycles from Different Salen Ligands and Arylboronic Acids



Rojas Lima, Susana

2001

Mario Sánchez, Herbert Höpfl, Maria-Eugenia Ochoa Becerra, José Norberto Farfán García, Rosa Luisa Santillán Baca, Susana Rojas-Lima. Preparation of Seven and Eight-Membered Boron Heterocycles from Different Salen Ligands and Arylboronic Acids. Inorg. Chem. 40, 6405-6412 (2001). DOI: 10.1021/ic010580g


Abstract


Arylboronic acids and different salen ligands have been brought to reaction in a 2:1 stoichiometry in ethanol, toluene, and acetonitrile. In all cases bimetallic boronates with chiral boron atoms could be isolated with the difference that in ethanol mostly open bimetallic boronic esters are obtained, while in toluene or acetonitrile closed bimetallic complexes with a central seven- or eight-membered heterocyclic ring are formed. Both structural types have been characterized by spectroscopic techniques and X-ray crystallography showing that the reactions are diastereoselective in the case of the bimetallic heterocyclic structures. The configurations and conformations of the seven- and eight-membered rings are different, and this may depend on steric effects and/or repulsive intramolecular ??? interactions between the two salicylidene moieties attached to the central ring.



Producto de Investigación




Artículos relacionados

Phenylmethyl 2,3,4-tri-O-acetyl--D-fucopyranoside

Synthesis and Study of Isomeric Benzo[1,4]oxazines and Benzothiazolines by NMR Spectroscopy and X-Ra...

Et3B, an Efficient Mediator for Xanthate Transfer Based Radical Processes

Synthesis of nitrogen-, oxygen- and sulphur-containing tripodal ligands with a trimethylbenzene core...

Preparation of Seven- and Eight-Membered Boron Heterocycles from Different Salen Ligands and Arylbor...

Study of the reactivity of squarylferrocenes. Addition of amines and aminoesters

Preparation of N-aryl-substituted spiro-?-lactams via Staudinger cycloaddition

A flexible access to highly functionalised boronates

Et3, and efficient Mediator for Xanthate Transfer Based Radical Processes.

Addition reaction of benzylbenzylidenenamine to lithium enolates of 1,3-dioxolan-4-one: synthesis of...