A Boron Protecting Group Strategy for 1,2-Azaborines
作者:Andrew W. Baggett、Shih-Yuan Liu
DOI:10.1021/jacs.7b09491
日期:2017.10.25
B-alkoxide fragments. This transformation allows alkyl and aryl groups to serve for the first time as removable protecting groups for the boron position of 1,2-azaborines during reactions that are not compatible with the easily modifiable B-alkoxide moiety. This reaction can be applied to synthesize a previously inaccessible BN isostere of ethylbenzene, a compound of interest in biomedical research. A sequence
作者:Shih-Yuan Liu、Hyelee Lee、Marisol Alvarado、Sarah Ingram、Bo Li
DOI:10.1055/a-2108-9895
日期:2023.11
General protocols for the N-functionalization of 1,2-azaborines with C(sp3), C(sp2), or C(sp) electrophiles are described. The syntheses of a new parental BN isostere of trans-stilbene and a BN isostere of a lisdexamfetamine derivative were accomplished with the developed methodology.
Protecting Group-Free Synthesis of 1,2-Azaborines: A Simple Approach to the Construction of BN-Benzenoids
作者:Eric R. Abbey、Ashley N. Lamm、Andrew W. Baggett、Lev N. Zakharov、Shih-Yuan Liu
DOI:10.1021/ja4073436
日期:2013.8.28
The protecting group-free synthesis of a versatile 1,2-azaborine synthon 5 is described. Previously inaccessible 1,2-azaborine derivatives, including the BN isostere of phenyl phenylacetate and BN1 triphenylmethane were prepared from 5 and characterized. The structural investigation of BN phenyl phenylacetate revealed the presence of a unique NH-carbonyl hydrogen bond that is not present in the corresponding carbonaceous analogue. The methyne CH in BN triphenylmethane was found to be less acidic than the corresponding proton in triphenylmethane. The gram-quantity synthesis of the parent 1,2-azaborine 4 was demonstrated, which enabled the characterization of its boiling point, density, refractive index, and its polarity on the E-T(30) scale.
Late-Stage Functionalization of 1,2-Dihydro-1,2-azaborines via Regioselective Iridium-Catalyzed C–H Borylation: The Development of a New N,N-Bidentate Ligand Scaffold
作者:Andrew W. Baggett、Monica Vasiliu、Bo Li、David A. Dixon、Shih-Yuan Liu
DOI:10.1021/jacs.5b01916
日期:2015.4.29
bromides furnishes 1,2-azaborine-based biaryl compounds including 6-[pyrid-2-yl]-1,2-azaborines that represent novel κ(2)-N,N-bidentate ligands. The 6-[pyrid-2-yl]-B-Me-1,2-azaborine ligand has been demonstrated to form an emissive coordination complex with dimesitylboron that exhibits bathochromically shifted absorption and emission maxima and a higher photoluminescence quantum yield compared to its
Nucleophilic Aromatic Substitution Reactions of 1,2-Dihydro-1,2-Azaborine
作者:Ashley N. Lamm、Edward B. Garner、David A. Dixon、Shih-Yuan Liu
DOI:10.1002/anie.201103192
日期:2011.8.22
Could go either way: The addition of nucleophiles to the parent 1,2‐dihydro‐1,2‐azaborine and subsequent quenching with an electrophile generates novel substituted1,2‐azaborine derivatives (see scheme). Mechanistic studies are consistent with two distinct nucleophilic aromatic substitution pathways depending on the nature of the nucleophile.