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
[EN] PROCESS FOR PREPARING AMINOTETRAHYDROPYRANS<br/>[FR] PROCÉDÉ DE PRÉPARATION D'AMINOTÉTRAHYDROPYRANES
申请人:F I S - FABBRICA ITALIANA SINTETICI S P A
公开号:WO2017093209A1
公开(公告)日:2017-06-08
The present invention relates to a process for preparing 3-amino tetrahydropyrans and, more particularly, to an improved method for synthesizing a 2,3,5-substituted tetrahydropyran derivative, intermediate being used in the preparation of dipeptidyl peptidase-IV enzyme inhibitors (DPP-4 inhibitors).
A Nitro Sugar-Mediated Stereocontrolled Synthesis of β2-Amino Acids: Synthesis of a Polyhydroxylated trans-2-Aminocyclohexanecarboxylic Acid
作者:José M. Otero、Fernando Fernández、Juan C. Estévez、Robert Nash、Ramón J. Estévez
DOI:10.1002/ejoc.201200103
日期:2012.5
The first stereocontrolled nitro sugar-mediated synthesis of polyhydroxylated β-amino acids and their incorporation into peptides is described. The key steps of this approach are a Michael addition of the lithium salt of tris(phenylthio)methane (a carboxyl synthetic equivalent) to sugar nitro olefins, and the reduction of the nitro group to an amino group. Specifically, two glyceraldehyde-based β-amino
Stereoselective Conjugate Additions of Alcohols to a Chiral (E)-Nitroalkene Derived From (R)-2,3-Isopropylidene Glyceraldehyde
作者:Qian Cheng、Takayuki Oritani、Alfred Hassner
DOI:10.1080/00397910008087321
日期:2000.1
Abstract Addition of functionalized alcohols to a chiral (E)-nitroalkene proceeded with modest to high diastereoselectivities depending on the presence of metal catalysts in low temperature. The results indicated that anti-selectivities were preferred in all cases.
Diastereoselective conjugate addition and cyclopropanation reactions with nitroalkenes derived from (R)-2,3-isopropylidene glyceraldehyde
作者:Guido Galley、Jan Hübner、Sven Anklam、Peter G Jones、Michael Pätzel
DOI:10.1016/0040-4039(96)01374-3
日期:1996.8
In the reactions of functionalized organometallics and of cyclopropanation reagents with chiral nitroalkenes 3 the conjugateaddition proceeded with modest to high diastereoselectivity depending on the metal and the substituent R. X-ray analyses showed the nitrocyclopropanes 6, formed with high stereoselectivity, to be syn-derivatives.