| 摘要 |
<p>A process for preparing a compound of formula (Ia): <CHEM> Äin which R<1>, R<2> and R<5> are each hydrogen or alkyl; R<3> and R<4> are each hydrogen, alkyl, formyl, alkylcarbonyl, arylcarbonyl, carboxy, alkoxycarbonyl, aryloxycarbonyl, hydroxy, alkylcarbonyloxy, formyloxy, arylcarbonyloxy, optionally substituted alkoxy or halogen; W is methylene, carbonyl or a group of formula >C=N-OV, in which V is hydrogen, alkylcarbonyl, arylcarbonyl or optionally substituted alkyl; and n is an integer of from 1 to 3Ü or a salt thereof by reduction of a compound of formula (I): <CHEM> or a salt thereof, in which R<1> to R<5>, W and n are as defined above.</p> |
