10.1007/s10593-009-0239-1
The research details the ionic hydrogenation of aryl-substituted 4H-selenopyrans, aiming to overcome the challenges associated with traditional hydrogenation methods that lead to the elimination of elemental selenium. The study successfully reports the first instance of ionic hydrogenation of 2,4,6-triaryl-4H-selenopyrans to produce the corresponding 2,4,6-triarylselenacyclohexanes. Key chemicals used in the process include triethylsilane as the reducing agent, trifluoroacetic acid as the catalyst, and helium as the gas carrier in GC/MS analysis. The research concluded that the isomer content of the product obtained through ionic hydrogenation was identical to that obtained by disproportionation, with the major isomer present in more than 97% purity for 2,4,6-triphenylselenacyclohexane (3), and about 70% for (p-methoxyphenyl)-2,6-diphenyl-4-selenacyclohexane (4). The findings provide a new method for the synthesis of aryl-substituted selenacyclohexanes with high isomer selectivity.
10.1021/jo801696r
The study describes the synthesis and intramolecular ene reaction of a chiral bicyclic lactam. The researchers first prepared the ene-substrate lactam 2 through an acetoacetate-based synthesis of 1,4-ketoacid 3. Lactam 2 underwent a thermal ene reaction at 280-300 °C to form tricycle 7. The ene reaction involved the C-C double bond of lactam 2 acting as the eneophile, activated by the carbonyl, while the ene component (CH2CdCMe2) was appended onto the angular position, R1. The ene product was then reduced using triethylsilane and TiCl4 to obtain bicyclic lactam 8, and the chiral auxiliary fragment was removed by lithium metal in liquid ammonia to yield the highly enantioenriched lactam system 9. The study highlights the successful execution of an intramolecular ene process on a chiral bicyclic lactam template, expanding the portfolio of highly enantioenriched products available from this template.
10.1055/s-1993-26018
The research aimed to reinvestigate the Stork-Ninomiya aza-annulation reaction and the subsequent stereospecific reduction of 1,4,5,6-tetrahydrobenzo[l]quinolin-3(2H)-ones using a triethylsilane-trifluoroacetic acid reagent system. The study sought to determine the chemical nature of the products formed during the aza-annulation reaction and to understand the stereochemical course of the reduction process. The researchers found that the reduction of the double bond in the aza-annulation products was not as stereospecific as previously claimed, due to the presence of positional isomers and possible tautomeric equilibria. The study used various chemicals, including β-tetralone pyrrolidine enamines, acrylamide, triethylsilane, trifluoroacetic acid, and lithium aluminum hydride, among others, to synthesize and reduce the target compounds.
10.1007/s11164-013-1460-1
The research investigates the synthesis and catalytic properties of an organoruthenium complex embedded within a biphenylene-bridged inorganic–organic hybrid mesoporous material (HMM–biph). The purpose is to explore the catalytic activity of this complex in the selective hydrosilylation of 1-hexyne with triethylsilane. The study concludes that the –[biphRuCp]PF6– complex within HMM–biph exhibits higher catalytic activity than a similar complex within phenylene-bridged HMM (HMM–phRuCp), attributed to the higher loading of the Ru complex in HMM–biph due to the electron-donating ability of biphenylene moieties. The research highlights the potential of tailored organic moieties in enhancing the catalytic performance of organometallic complexes embedded in hybrid mesoporous materials.