912652-02-9Relevant academic research and scientific papers
Synthesis of C-linked carbo-β2-amino acids and β2-peptides: Design of new motifs for left-handed 12/10- and 10/12-mixed helices
Sharma, Gangavaram V. M.,Reddy, Nelli Yella,Ravi, Rapolu,Sreenivas, Bommagani,Sridhar, Gattu,Chatterjee, Deepak,Kunwar, Ajit C.,Hofmann, Hans-J?rg
supporting information, p. 9191 - 9203 (2013/01/15)
C-linked carbo-β2-amino acids (β2-Caa), a new class of β-amino acid with a carbohydrate side chain having d-xylo configuration, were prepared from d-glucose. The main idea behind the design of the new β-amino acids was to move the steric strain of the bulky carbohydrate side chain from the Cβ- to the Cα-carbon atom and to explore its influence on the folding propensities in peptides with alternating (R)- and (S)-β2-Caas. The tetra- and hexapeptides derived were studied employing NMR (in CDCl3), CD, and molecular dynamics simulations. The β2-peptides of the present study form left-handed 12/10- and 10/12-mixed helices independent of the order of the alternating chiral amino acids in the sequence and result in a new motif. These results differ from earlier findings on β3-peptides of the same design, containing a carbohydrate side chain with d-xylo configuration, which form exclusively right-handed 12/10-mixed helices. Quantum chemical calculations employing ab initio MO theory suggest the side chain chirality as an important factor for the observed definite left- or right-handedness of the helices in the β2- and β3-peptides.
Novel formal synthesis of stereospecifically C-6 deuterated d-glucose employing configurationally stable alkoxymethyllithiums
Kapeller, Dagmar C.,Hammerschmidt, Friedrich
experimental part, p. 591 - 598 (2010/09/05)
The synthesis and testing of configurational stability of chirally monodeuterated PMB- and THP-substituted oxymethyllithiums are described. Macroscopically they are configurationally stable up to -35 °C, the limit of their chemical stability, and microscopically even up to 0 °C. Furthermore, THP-protected oxy-[D1]methyllithium has been applied in the formal synthesis of (6R)-[6-D1]-d-glucose (four steps, 40% yield), an example of its use as a homochiral hydroxymethyl synthon.
