Catalytic Deoxygenation of Amine and Pyridine <i>N</i>-Oxides Using Rhodium PC<sub>carbene</sub>P Pincer Complexes
作者:Hendrik Tinnermann、Simon Sung、Beatrice A. Cala、Hashir J. Gill、Rowan D. Young
DOI:10.1021/acs.organomet.9b00778
日期:2020.3.23
Rhodium PCcarbeneP pincercomplexes 1-L (L = PPh3, PPh2(C6F5), PCy3) readily facilitate deoxygenation of amine and pyridine N-oxides. The resulting complexes exhibit η2-C═O coordination of the resulting keto POP pincerligand. These η2-C═O linkages in the metalloepoxide complexes are readily reduced by isopropyl alcohol and various benzylic alcohols. Thus, efficient catalytic deoxygenation of amine
A simple and efficient method for the deoxygenation of amine N-oxides to corresponding amines is reported using the green and economical reagent phenylboronic acid. Deoxygenation of N,N-dialkylaniline N-oxides, trialkylamine N-oxides and pyridineN-oxides were achieved in good to excellent yields. The reduction susceptible functional groups such as ketone, amide, ester and nitro groups are well tolerated
aromatic amines, anilines and tertiaryamines with dimethyldioxirane (DMD) was examined. Treatment of heterocyclic aromatic amines and anilines with a slight excess of DMD at 0 °C afforded the corresponding N-oxides in quantitative conversion yields. In addition, the oxidation was chemoselective in the presence of carbon-carbon double bonds. On the other hand, most of the tertiaryamines assayed did
is achieved under mild conditions. The reagent combination employed for this transformation is polymethylhydrosiloxane (PMHS) in the presence of either tetrakis (triphenylphosphine) palladium (0) [Pd(PPh 3 ) 4 ], titanium (IV) isopropoxide [Ti(i-PrO) 4 ] or palladium on carbon (Pd/C).
“Selenium Polonovski Reaction” Using Benzeneselenenyl Triflate
作者:Renji Okazaki、Yukinori Itoh
DOI:10.1246/cl.1987.1575
日期:1987.8.5
Selenoxyammonium salts prepared from tertiary amine N-oxides and benzeneselenenyltriflate undergo rearrangement in the presence of triethylamine or DBU to give α-selenoxyamines, which react in situ with an electrophile or nucleophile to afford new secondary or tertiary amine derivatives.