| 摘要 |
The present invention provides a process for preparing a compound of formula (I): wherein R<1> and R<2> each independently represent C1-C4 alkyl; and X represents an alkyl, alkenyl, cycloalkyl, aryl, substituted aryl, heterocycle, or substituted heterocycle, comprising treating a compound of formula (II): wherein Q represents Cl or Br, with a suitable base followed by addition of a suitable Lewis acid and addition of a compound of formula R<->M<+> wherein M<+> is a suitable cation.
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