申请人:Erler Joachim
公开号:US20100210860A1
公开(公告)日:2010-08-19
The present invention relates to a method for the preparation of dronabinol ((6aR-trans)-6a,7,8,10a-tetrahydro-6,6,9-trimethyl-3-pentyl-6H-dibenzo[b,d]pyran-1-ol, Δ
9
-tetrahydrocannabinol (Δ
9
-THC)) from cannabidiol (CBD) by cyclization of cannabidiol (CBD) (2-[1R-3-methyl-6-(1-methylethenyl)-2-cyclohexene-1-yl]-5-pentyl-1,3-benzoldiol) to Δ
9
-THC. The method according to the present invention is characterized in that cannabidiol (CBD) (B) is present in an organic solvent and cyclized to Δ
9
-THC in the presence of a molecular sieve while being heated.
It was found out that, in the method of the present invention, the molecular sieve not only has the previously mentioned drying properties, but also exhibits strong catalytic properties which are important in this reaction. Normally, cyclizations carried out in the presence of a Lewis acid catalyst only are distinctly slower and the Δ
9
-THC yield is lower than in cyclizations carried out in the present of a molecular sieve.
本发明涉及一种从大麻二酚(CBD)通过环化反应制备得到脱羧麻酚(THC)的方法。所述方法的特点在于将大麻二酚(CBD)(B)置于有机溶剂中,在分子筛的存在下加热环化反应得到脱羧麻酚(THC)。发现在本发明中,分子筛不仅具有干燥性能,还具有强催化性能,在此反应中非常重要。通常,在存在路易斯酸催化剂的情况下进行的环化反应速度较慢,脱羧麻酚(THC)产率较低,而在分子筛的存在下进行的环化反应则不同。