Abstract
Dimethyl cyclopropane-1,1-dicarboxylate is readily subjected to reductive ring opening reaction with samarium(II) iodide in the presence of tris(dibenzoyl-methiodo)iron(III). The generated organosamarium intermediate is trapped by aliphatic ketones to afford 5,5-disubstituted 2-methoxycarbonyl-5-pentanolides.
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