| 摘要 |
<p>Improvements in the yield of the antiviral agent of formula (I) are obtained by employing Dess-Martin periodinane to convert the cyclopentol of formula (VI) to the cyclopentanone of formula (VIII) and the methylenation of this cyclopentanone to the compound of formula (XI) by use of a Nysted reagent, Tebbe reagent, or a reagent prepared from zinc powder, diiodomethane, lead powder or lead chloride, and titanium tetrachloride in a suitable solvent.</p> |
