| 摘要 |
<p>As an industrially advantageous process for forming a carbon-carbon bond at the 5-position of oxazole is provided a process for preparing compounds of general formula (III) or salts thereof (wherein R?1 and R2¿ are each hydrogen, optionally substituted hydrocarbyl, or an optionally substituted heterocyclic group; R3 is an electron-withdrawing group; and R?4, R5 and R6¿ are each hydrogen or optionally substituted hydrocarbyl), characterized by reacting a compound of general formula (I) or a salt thereof (wherein each symbol is as defined above) with a compound of general formula (II) or a salt thereof (wherein each symbol is as defined above) in the presence of an acid or a base.</p> |
