Acyclic C-nucleosides: synthesis of chiral 1,1-diheteroaryl-alditols and X-ray crystal structure of 2,3,5-tri-O-benzyl-1,1-di-(2′-pyrryl)-1-deoxy-d-arabinitol
作者:Mara Cornia、Silvia Capacchi、Monica Del Pogetto、Giorgio Pelosi、Giovanna Gasparri Fava
DOI:10.1016/s0957-4166(97)00328-5
日期:1997.9
Tetra-O-acetyl-D-ribose, penta-O-acetyl-o-glucose, 2,3;5,6-di-O-isopropylidene-D-mannofuranose, 2,3,5-tri-O-benzyl-D-arabinofuranose and 2,3,5,6-tetra-O-benzyl-D-glucose react with pyrrole and indole, in presence of Lewis acids, to afford C-glycosylpyrroles and indoles in position 2 and 3 respectively (acyclic C-nucleosides, 1-7). The crystal structure of 4 was determined by X-ray crystallography. (C) 1997 Published by Elsevier Science Ltd.
Synthesis of Cycloalkanoindoles by an Unusual DAST-Triggered Rearrangement Reaction
A series of 1,1-bis(indol-3-yl) and 1-(indol-2-yl)-1-(indol-3-yl)-ψ-hydroxyalkanes, prepared from the corresponding indole derivatives and suitable hydroxyaldehydes via routine coupling reactions, were treated with DAST (diethylaminosulfur trifluoride) under mild conditions, to generate a small library of cycloalkanoindoles. Irrespective of the substitution pattern, i.e. whether they are symmetrical