Nitrones in Organic Synthesis. Synthesis of Secondary Allyl Amines
作者:A. Dondoni、F. L. Merchán、P. Merino、T. Tejero
DOI:10.1080/00397919408010566
日期:1994.10
Abstract Nitrones 1 undergo addition of vinyl organomagnesium bromide to give the allyl hydroxylamines 3 which are easily reduced to the corresponding N-benzyl allyl amines 2.
hydroxylamines was observed in iridium-catalyzedreaction. Regio- and enantioselectiveallylic substitution of the unsymmetrical phosphates with hydroxylamines was studied by using the iridium complex of chiral pybox ligand. The aqueous-medium reaction with hydroxylamines proceeded smoothly in the presence of Ba(OH)2·H2O to give the branched products with good enantioselectivities.
Improved dimethylzinc-promoted vinylation of nitrones with vinylboronic esters
作者:Nageswaran PraveenGanesh、Cristina de Candia、Antony Memboeuf、György Lendvay、Yves Gimbert、Pierre Y. Chavant
DOI:10.1016/j.jorganchem.2010.07.009
日期:2010.10
Vinylboronic esters derived from 4,4,6-trimethyl-[1,3,2]dioxaborinane react with nitrones in the presence of dimethylzinc; nucleophilic addition of the vinyl group onto nitrones produces N-allylic hydroxylamines in fair yields. The sequence is compatible with various functional groups on the vinylic moiety. The mechanism and kinetic aspects are discussed on the basis of DFT calculations. (C) 2010 Elsevier B. V. All rights reserved.
Synthesis of unsaturated [1,2]oxazines by using sigmatropic rearrangements and the ring-closing metathesis reaction
作者:Alexandre Le Flohic、Christophe Meyer、Janine Cossy、Jean-Roger Desmurs
DOI:10.1016/j.tetlet.2003.09.125
日期:2003.11
Various substituted unsaturated [1,2]oxazines have been synthesized by using a [2,3]- or a [3,3]-sigmatropic rearrangement and a ring-closing metathesis reaction as key steps. (C) 2003 Published by Elsevier Ltd.