| 摘要 |
<p>The present invention provides a process for preparing a compound of formula (I): wherein R?1 and R2¿ each independently represent C¿1?-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.</p> |
