| 摘要 |
<p>A process for producing a compound represented by formula (II) (wherein R?1, R2, R3, and R4¿ each independently represents hydrogen, alkyl, alkoxy, etc.; R5 represents alkyl or alkoxyalkyl; A represents O or S; Ar represents aryl, etc.; * indicates the position of an asymmetric carbon atom and that the compound is the (R) or (S) isomer; and Q represents an optically active reagent), characterized by isolating the target compound as crystals from a solution or suspension containing a compound represented by formula (II) (wherein * indicates the position of an asymmetric carbon atom and that the compound is the (R) or (S) isomer or is a mixture of both, and the other symbols have the same meanings as the above).</p> |
