Synthesis of triterpene glycosides
Summary1. The acyl-β-D-glucopyranosides, acyl-β-D-xylopyranosides, and acyl-α-L-arabinopyranosides of oleanolic and ursolic acids have been synthesized for the first time.2. A method for the synthesis of acyl glycosides of triterpene hydroxyacids with hindered carboxy groups has been developed.
Preparation of Acetobrome-Sugars
THE preparation of acetobrome-sugars involves generally the use of hydrogen bromide dissolved in glacial acetic acid or acetic anhydride. These solutions are very disagreeable to handle and to prepare; we therefore tried to circumvent their use, and after some preliminary experiments found a really satisfactory way of doing so.
ber Eine Neue Methode zur Synthese von a-Glykosiden
1-[2.4.6-Trimethyl-benzoyl]-β-D-glucose (Ia) und -galaktose (Ib) setzen sich in Alkoholen wie Methanol, Athanol und Allylalkohol bei Gegenwart saurer Kata-lysatoren schon bei Raumtemperatur recht glatt zu den entsprechenden α-Glykosiden um.