反应详情

In this process of the second aspect of the invention, the starting esterastin may be dissolved in an organic solvent such as a lower alkanol, for example, methanol or ethanol which is inert to the reaction involved. To this solution is added an amount of a known hydrogenation catalyst such as platinum oxide or palladium metal. The amount of the catalyst may be 2~20% by weight of the starting esterastin. The reduction may carried out in a stream of hydrogen gas or in Parr-apparatus at ambient temperature for a period of time of 2 hours to 12 hours. Usually, it suffices that the catalytic reduction is carried out overnight. After the reaction is completed, the reaction mixture is filtered to remove the catalyst, and the filtrate is concentrated to dryness to afford a crude powder of tetrahydroesterastin.

1. customis inert to the reaction involved
2. filtrationthe reaction mixture is filtered
3. customto remove the catalyst
4. concentrationthe filtrate is concentrated to dryness