Optically active nitroalkenes—synthesis, addition reactions and transformation into amino acids
作者:Jan Hübner、Jürgen Liebscher、Michael Pätzel
DOI:10.1016/s0040-4020(02)01406-0
日期:2002.12
Optically active nitroalkenes 4 were synthesized via Henry reaction. Conjugateaddition of vinylmagnesium bromide to 4 gave nitroalkane syn-5 while cyclopropanation with sulfur ylides or dibromocarbene afforded nitrocyclopropanes 8, 10 and 11 in a diastereoselective manner. These products were used to synthesize optically active β-amino acids 7 and 16 as well as cyclopropane γ-amino acids 19 and 20
Stereoselective aza-MIRC reactions on optically active (E)-nitro alkenes
作者:Stefania Fioravanti、Fabio Marchetti、Lucio Pellacani、Luca Ranieri、Paolo A. Tardella
DOI:10.1016/j.tetasy.2007.12.007
日期:2008.2
Opticallyactive (E)-nitro alkenes carrying a 1,3-dioxolane or 1,3-oxazolidine residue undergo stereoselective aza-MIRC reactions, leading to the synthesis of the corresponding chiral nitro aziridines in high yields and with good diastereoselectivity. Interestingly, the stereochemical outcome of the aziridination reactions was strongly influenced by the chiral residue considered, giving stereoisomers