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2005
Furan derivatives
R 0060
One-Pot Synthesis of 3-Hydroxymaleic Anhydrides by Cyclization of 1,1-Bis(triAcetals with Oxalyl Chloride. — The title method is developed
20- 101 methylsiloxy)ketene
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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