Latest advances on regiospecific microwave-assisted synthesis of novel purine derivatives as antitumor agents

Catalytic Enantioselective Synthesis of 1,4-Benzodioxepines

An efficient organocatalytic enantioselective synthesis of chiral 1,4-benzodioxepines is described. By proper incorporation of an intramolecular oxetane desymmetrization process, a range of benzylic alcohols bearing an internal oxetane reacted in the presence of a suitable chiral phosphoric acid catalyst to form chiral 1,4-benzodioxepines with high enantioselectivity. This process provides a new catalytic asymmetric example of direct synthesis of seven-membered heterocycles with good stereocontrol.

NBS/DMSO-mediated synthesis of (2,3-dihydrobenzo[b][1,4]oxathiin-3-yl)methanols from aryloxymethylthiiranes

(2,3-Dihydrobenzo[b][1,4]oxathiin-3-yl)methanols are synthesized from aryloxymethylthiiranes via NBS-mediated aromatic electrophilic substitution, DMSO nucleophilic ring-opening, and water displacement.