| 摘要 |
<p>A process for the production of a compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein: R1 and R2 are independently phenyl or 4-fluorophenyl; R3 is hydrogen, alkyl or methoxycarbonyl; R4 is hydrogen or methyl; which comprises reaction of a compound of formula (II) with a compound of formula (III), wherein R5-R10 are independently alkyl to give a compound of formula (IV), followed by deprotection and optionally thereafter forming a pharmaceutically acceptable salt.</p> |
