Er(OTf)<sub>3</sub> as a Valuable Catalyst in a Short Synthesis of 2′,3′-Dideoxy Pyranosyl Nucleosides via Ferrier Rearrangement
作者:Antonio Procopio、Renato Dalpozzo、Antonio De Nino、Monica Nardi、Manuela Oliverio、Beatrice Russo
DOI:10.1055/s-2006-942443
日期:2006.8
Er(OTf) 3 is a useful catalyst for the Ferrier rearrangement furnishing 2',3'-dideoxy pyranosyl nucleosides easily by means of cleaner reaction profiles, short reaction times, mild reaction conditions, good stereoselectivity, and good recoverability of the commercially available catalyst.
Nucleosides and nucleotides. LXII. Synthesis and optical properties of 2,3-dideoxy-D-erythro-hex-2-enopyranosyl nucleosides.
作者:TOHRU UEDA、SHINICHI WATANABE
DOI:10.1248/cpb.33.3689
日期:——
Condensation of 3, 4, 6-tri-O-acetyl-D-glucal and trimethylsilylated nucleobases in the presence of stannic chloride or trimethylsilyl trifluoromethanesulfonate gave anomeric mixtures of 2, 3-dideoxy-D-erythro-hex-2-enopyranosyl nucleosides. The signs of the circular dichroism (CD) spectra of the anomeric 2-hexenopyranosyl nucleosides are opposite to those of usual nucleosides or glucopyranosyl nucleosides. Other examples illustrating the contribution of an unsaturated bond in the sugar portion of nucleosides to the CD spectra are also presented.
excellent yields under mild conditions by the condensation of acetylated glycals with purine or pyrimidine derivatives in the presence of trityl perchlorate. The synthesis of (α- and β-hex-2-enopyranosyl-4-ulose)theophylline nucleosides labelled at position 3′ with deuterium is described.