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2005
Multi-membered O,S-heterocycles
R 0691
A New Method for the Lactonization of ω-Hydroxy Carboxylic Acids with
Carbonate by the Promotion of DMAP and Iodine. — Successive
24- 151 Di-2-thienyl
reactions of ω-hydroxycarboxylic acids (I) with an equimolar amount of di-2-thienyl
carbonate in the presence of DMAP followed by the addition of iodine affords the corresponding macrolactones (II) along with the diolides (III) as by-product. The optimization of the reaction conditions for both steps is given. — (OOHASHI, Y.;
FUKUMOTO, K.; MUKAIYAMA*, T.; Chem. Lett. 34 (2005) 1, 72-73; Cent. Basic
Res., Kitasato Inst., Kita, Tokyo 114, Japan; Eng.) — H. Haber
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