2005

Furan derivativesR 0060 One-Pot Synthesis of 3-Hydroxymaleic Anhydrides by Cyclization of 1,1-Bis(tri-

methylsiloxy)ketene Acetals with Oxalyl Chloride. — The title method is developed for a variety of 1,1- bis(trimethylsilyloxy)ketene acetals with aryl, alkyl, aryloxy or alkyloxy substituents. In the case of alkyl derivatives, the yields increase with the length of the chain. Generally, the cyclizations proceed in good to moderate yields and with very good regioselectivity. — (ULLAH, E.; LANGER*, P.; Synlett 2004, 15, 2782-2784; Inst. Chem. Biochem., Ernst-Moritz-Arndt-Univ., D-17487 Greifswald, Germany; Eng.) — Steudel

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