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Oxazole derivativesR 0220 Zirconyl Chloride: An Efficient Recyclable Catalyst for Synthesis of 5-Aryl-2-oxa-

zolidinones from Aziridines and CO2 under Solvent-Free Conditions. — Cycload-dition reaction of aziridines, e.g. (I), with carbon dioxide proceeds smoothly under sol-vent-free conditions in the presence of air-stable and inexpensive catalyst ZrOCl2 to give the target oxazolidinones. In most cases, excellent regioselectivity for the 5-sub-stituted derivatives (III) is achieved. The reaction proceeds with retention of stereo-chemistry starting from enantiopure aziridine (VIII). — (WU, Y.; HE*, L.-N.; DU, Y.; WANG, J.-Q.; MIAO, C.-X.; LI, W.; Tetrahedron 65 (2009) 31, 6204-6210; Inst. Elem.-Org. Chem., Nankai Univ., Tianjin 300071, Peop. Rep. China; Eng.) — Mischke

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