213598-45-9Relevant articles and documents
Oxidation of hydroxylamines to nitrones catalyzed by (salen)Mn(III) complexes. Enantioselective synthesis of a protected cis-dihydroxypyrroline N-oxide with Jacobsen catalyst
Cicchi, Stefano,Cardona, Francesca,Brandi, Alberto,Corsi, Massimo,Goti, Andrea
, p. 1989 - 1992 (1999)
Oxidation of N,N-disubstituted hydroxylamines to nitrones catalyzed by the Jacobsen catalyst occurs cleanly in the presence of hydrogen peroxide, sodium hypochlorite or iodosylbenzene as the stoichiometric oxidant. Meso 3,4-cis-isopropylidenedioxy-1-hydro
Straightforward synthesis of enantiomerically pure (3S,4R)- and (3R,4S)-3,4-isopropylidenedioxypyrroline 1-oxide, precursors of functionalized cis-dihydroxy azaheterocycles, by a novel "one-pot" procedure
Cicchi, Stefano,Corsi, Massimo,Brandi, Alberto,Goti, Andrea
, p. 1678 - 1681 (2002)
The enantiomerically pure nitrone 3, a valuable precursor of mono- and bicyclic azaheterocycles, has been synthesized in 57% yield by a novel "one-pot" process starting from lactol 1, in turn readily available from Darabinose. The same process, consisting
Synthesis of a new chiral pyrrolidine
Flores, Mari Fe,Nunez, Marta G.,Moro, Rosalina F.,Garrido, Narciso M.,Marcos, Isidro S.,Iglesias, Enrique F.,Garcia, Pilar,Diez, David
experimental part, p. 1501 - 1512 (2010/09/08)
The synthesis of a new chiral pyrrolidine has been performed using 2,3-O-isopropylidene-D-erythronolactol as a suitable starting material.
Kinetic and thermodynamic aspects in the 1,3-dipolar cycloaddition of five-membered cyclic nitrones to α,β-unsaturated γ- and δ-lactones
Stecko, Sebastian,Pasniczek, Konrad,Jurczak, Margarita,Urbanczyk-Lipkowska, Zofia,Chmielewski, Marek
, p. 1085 - 1093 (2008/02/08)
The 1,3-dipolar cycloaddition of five-membered ring nitrones to the α,β-unsaturated δ-lactones is kinetically controlled, whereas the same reactions involving γ-lactones, upon heating and prolonged reaction times, display visible reversibility of the reac
One-pot synthesis of cyclic nitrones and their conversion to pyrrolizidines: 7a-epi-crotanecine inhibits α-mannosidases
Cicchi,Marradi,Vogel,Goti
, p. 1614 - 1619 (2007/10/03)
A new straightforward and inexpensive one-pot procedure is described for the preparation of enantiopure five-membered cyclic nitrones starting from the corresponding lactols. Its efficiency relies on the condensation of unprotected hydroxylamine with read
Nitrone cycloadditions to isolevoglucosenone: Ready access to a new class of directly linked (1→3)-imino-C-disaccharides
Cardona, Francesca,Goti, Andrea,Brandi, Alberto
, p. 1475 - 1478 (2007/10/03)
(Matrix presented) Straightforward access to a new class of D-gulo- and D-allo-derived directly linked (1→3)-imino-C-disaccharides by means of cycloaddition reactions of enantiopure polyhydroxylated pyrroline N-oxides with isolevoglucosenone is reported. The cycloaddition reactions display a high level of double asymmetric induction, which allows a partial kinetic resolution of a racemic nitrone.
TBAT-mediated nitrone formation of ω-mesyloxy-O-tert-butyldiphenylsilyloximes: Facile synthesis of cyclic nitrones from hemiacetals
Tamura, Osamu,Toyao, Atsushi,Ishibashi, Hiroyuki
, p. 1344 - 1346 (2007/10/03)
Chiral and cyclic nitrones were synthesized by TBAT-mediated desilylative cyclization of ω-mesyloxy-O-tert-butyl-diphenylsilyloximes, readily prepared from sugar derivatives by a consecutive treatment with O-tert-butyldiphenylsilylhydroxylamine and with m
Manganese dioxide oxidation of hydroxylamines to nitrones
Cicchi, Stefano,Marradi, Marco,Goti, Andrea,Brandi, Alberto
, p. 6503 - 6505 (2007/10/03)
Several structurally differentiated N,N-dialkylhydroxylamines were oxidised to the corresponding nitrones using MnO2. Manganese dioxide revealed an efficient and mild reagent for oxidation of hydroxylamines, showing a level of regioselectivity
Complete stereoselective synthesis of quasi-enantiomeric pseudo imino-C- disaccharides: Parallel kinetic resolution of a racemic cis- dihydroxypyrroline N-oxide by 1,2-glycals
Cardona, Francesca,Valenza, Silvia,Goti, Andrea,Brandi, Alberto
, p. 1319 - 1323 (2007/10/03)
Cycloadditions of hydroxylated enantiopure pyrroline N-oxides to 1,2- glycals display high double-asymmetric induction. The selectivity is controlled by the stereochemistry at C-3 of the glycal. A parallel kinetic resolution experiment with a racemic cis-dihydroxypyrroline N-oxide allowed the synthesis of two different pseudo imino-C-disaccharides precursors in a completely enantiopure form, totally avoiding the formation of minor cycloadducts.