Multi-component synthesis of dihydro-1,3-azaborinine derived oxindole isosteres

Synthetic Doping of Acenaphthylene through BN/CC Isosterism and a Direct Comparison with BN-Acenaphthene

Boron/nitrogen-doped acenaphthylenes, a new class of BN-doped cyclopenta-fused polycyclic aromatic hydrocarbons, were synthesized via indole-directed C-H borylation. The reference molecule BN-acenaphthene was also synthesized in a similar manner. Both BN-acenaphthylene and BN-acenaphthene were unequivocally characterized by single-crystal X-ray analysis. The aromaticities of each ring in BN-acenaphthylenes were quantified by experimental and theoretical methods. Moreover, doping the BN unit into acenaphthylene can increase the LUMO level and decrease the HOMO level, resulting in wider HOMO-LUMO energy gaps. Furthermore, regioselective bromination of BN-acenaphthylene (B-Mes) afforded monobrominated BN-acenaphthylene in good yield. Subsequently, cross-coupling of brominated BN-acenaphthylene gave a series of BN-acenaphthylene derivatives. In addition, the photophysical properties of these BN-acenaphthylene derivatives can be fine-tuned by the substituents on the BN-acenaphthylene scaffold.

An Olefin-based Multi-component Reaction to 1,2-Azaborolidine Derivatives

Reaction of the borane FmesBH2·SMe2 [Fmes: 2,4,6-tris(trifluoro-methyl)phenyl] with two molar equivs of a small series of 1-alkenes followed by treatment with two molar equivalents of the bulky isonitrile CN-Xyl (Xyl:...

Formation of cyclic (boryl)iminomethane derivatives by the insertion of isocyanides into a boron-carbon bond

Isocyanides are highly valuable reagents in organic synthesis and have been widely used in multicomponent reactions. Although η²-imidoyl metal complexes, which are important intermediates in isocyanide chemistry, have been extensively explored, their boron species analogues have remained elusive. Hererin, we reported the synthesis of cyclic (boryl)iminomethanes via direct isocyanide insertion into the B-C bond of amino alkenyl boranes in a facile synthetic procedure. A family of well-defined cyclic (boryl)iminomethanes are characterized. Furthermore, the intrinsic ring strain of cyclic (boryl)iminomethanes primes them to further react with isocyanides and selectively afford double insertion products. Our results provide new insights into novel isocyanide chemistry involving boron species.