An efficient method to synthesize N/O, O-difluoroboron complexes from alkynes

Deconstructive Cycloaromatization Strategy toward N,O-Bidentate Ligands from Indolizines and Cyclopropenones

“…Organic BF 2 complexes are widely used in numerous fields, including organic synthesis, catalysis, drug discovery, and materials science . Inspired by the success in the construction of N , O -bidentate ligands described above, we continued to expand this one-pot protocol to build N , O -bidentate organic BF 2 complexes (Scheme ).…”

Octa‐Substituted Resorcinarene Based Supramolecules and Its Liquid Crystalline and Biological Applications

“…[4] They are commonly characterized in literature as a form of their oxygen bridged derivatives, the cavitands (a container-shaped molecule), and various types of supramolecular assemblages. [5][6][7][8][9][10][11] Different Lewis acid catalysts were used to synthesize Resorcin [4]arene and its derivatives, including Con. HCl, [12] trifluoroacetic acid, [13] TSA (Tungstant sulphuric acid), [14] MSA (molybdate sulphuric acid), [15] iodine, [16] and so on.…”

“…Resorcin[4]arene is a versatile subclass with eight hydroxyl polar groups on the upper rim, making it the optimum active site for substitution to generate a wide range of compounds and expand their applications [4] . They are commonly characterized in literature as a form of their oxygen bridged derivatives, the cavitands (a container‐shaped molecule), and various types of supramolecular assemblages [5–11] …”

Modular construction of α-furanyl ketones via semi-pinacol rearrangement-mediated ring expansion

“…As has been well recognized, semi-pinacol rearrangement functions as an exceptionally useful methodology in the synthesis of functionalized ketones. 10 As a continuation of our interest in alkyne chemistry 11 and also inspired by metal carbene-involved semi-pinacol rearrangement, 12 we have developed the construction of chemically and structurally well-defined oligo(arylfurans) via a de novo synthesis of bifuran monomers by 1,2-alkyne migration and a subsequent palladium-catalyzed cross-coupling reaction (Scheme 1d). 13 On the other hand, transition-metal-catalyzed cyclization reactions of conjugated enynals or enynones through a 5- exo-dig nucleophilic attack have become an efficient way to generate the α-furanyl carbene intermediate.…”

“…Based on our previous reports, 11,13 a plausible reaction mechanism was then proposed. As shown in Scheme 3, the alkyne moiety of 1 is initially activated by the platinum catalyst, which is then attacked by the carbonyl oxygen through 5- exo-dig cyclization to form zwitterionic intermediate A , which will isomerize to its resonance structure, (2-furyl)carbene complex B .…”