17301-81-4Relevant articles and documents
Lewis acid-promoted electron transfer deoxygenation of epoxides, sulfoxides, and amine N-oxides: the role of low-valent niobium complexes from NbCl5 and Zn
Oh, Kyungsoo,Knabe, William Eric
supporting information; experimental part, p. 2966 - 2974 (2009/05/30)
A mild and operationally simple deoxygenation of epoxides, sulfoxides, and amine N-oxides is described using a sub-stoichiometric amount of low-valent niobium complexes generated in situ from commercially available NbCl5 and zinc dust. The deoxygenation proceeds by a reductive cleavage of polarized O-C/O-N/O-S bonds through a single electron transfer from zinc metal to the niobium-substrate complex due to the high oxophilic nature of the niobium species. The presence of adjacent radical-stabilizing groups is beneficial to epoxide substrates; however the similar prerequisite does not apply to sulfoxides and amine N-oxides, where a broad range of substrates are efficiently deoxygenated in excellent yields.
Chiral tertiary amine N-oxides in asymmetric epoxidation of α,β-unsaturated ketones
Oh, Kyungsoo,Ryu, Jinhyang
, p. 1935 - 1938 (2008/09/19)
Chiral tertiary amine N-oxides have been shown to undergo stereoselective oxygen transfer reaction in the epoxidation of chalcone derivatives with modest to good enantioselectivity.
Effects of N-oxidation on the 15N chemical shifts in the Strychnos alkaloids strychnine and brucine
Hadden, Chad E.,Kaluzny, Brian D.,Robins, Russell H.,Martin, Gary E.
, p. 325 - 327 (2007/10/03)
The effects of N-oxidation on the 15N chemical shifts of the Strychnos alkaloids strychnine and brucine are discussed. The 15N shifts were determined using the inverse-detected, long-range GHMBC experiment at natural abundance. Following N-oxidation, the N-19 resonance shifted downfield from 35.0 ppm in strychnine to 136.3 ppm in the N-19-oxide. The N-19 resonance of brucine shifted downfield from 35.9 to 135.5 ppm in the N-19-oxide. Small upfield shifts were observed for the N-9 resonances of both N-oxides. The 1H and 13C shifts of both N-oxides were assigned using inverse-detected 2D NMR methods to ensure proper assignments of the long-range 1H-15N couplings. Copyright