Enantioselective Synthesis of Chiral Indane Derivatives by Rhodium-Catalyzed Addition of Arylboron Reagents to Substituted Indenes
作者:Moeko Umeda、Hikaru Noguchi、Takahiro Nishimura
DOI:10.1021/acs.orglett.0c03651
日期:2020.12.18
asymmetric addition of arylboron reagents to indene derivatives proceeded to give 2-arylindanes in good yields with high enantioselectivity. Deuterium-labeling experiments indicated that the present reaction involved a 1,4-Rh shift from an initially formed benzylrhodium to an arylrhodium intermediate before protonation leading to the corresponding addition product. The asymmetric addition was also successful
Oxidative cyclotrimerization of unsaturated compounds with DDQ and triflic acid: An efficient synthetic route to triply-fused benzene rings
作者:Hee Yeon Cho、Lawrence T. Scott
DOI:10.1016/j.tetlet.2014.12.141
日期:2015.6
Intermolecular oxidative cyclotrimerization reactions of alkenes and aromatic compounds with DDQ and trifluoromethanesulfonic acid are described. Scholl-type oxidation reactions involving alkenes have not previously been demonstrated. Moreover, the DDQ/acid system has never been used for intermolecular oxidative cyclization reactions. This convenient, metal-free reagent system (DDQ/TfOH) is advantageous
model developed by Michl to magnetic circular dichroism spectroscopic data and theoretical calculations demonstrate that there is a marked redshift of the near‐IR absorption maxima relative to cyclo[8]isoindole because there is a significant stabilization of the LUMO due to the differing effects of a fused ring expansion with acenaphthylene and benzene moieties on the frontier π molecular orbitals.
Diels–Alder reactions of 3,6-disubstituted 1,2,4,5-tetrazines. Synthesis and X-ray crystal structures of diazafluoranthene derivatives
作者:Nelli Rahanyan、Anthony Linden、Kim K. Baldridge、Jay S. Siegel
DOI:10.1039/b820551e
日期:——
The synthesis of a series of 3,6-disubstituted-1,2,4,5-tetrazines has been effected using an inverse electron demand [2 + 4] cycloaddition strategy. The crystalstructures of 18 members of this series of diazafluoranthenes are reported. Stereochemical analysis shows that diazafluoranthenes, substituted across the bay region, are helically-twisted strained aromatic molecules. The dihedral angle between
Cu(<scp>i</scp>) and Ag(<scp>i</scp>) complexes of 7,10-bis-N-heterocycle-diazafluoranthenes: programmed molecular grids?
作者:Nelli Rahanyan、Simon Duttwyler、Anthony Linden、Kim K. Baldridge、Jay S. Siegel
DOI:10.1039/c4dt01460j
日期:——
Reactions of 7,10-disubstituted diazafluoranthene derivatives with three different silver(i) salts AgX (X = [PF6]−, [SbF6]−, [CB11HCl11]−) and [Cu(CH3CN)4]PF6 afforded complexes exhibiting five different motifs.