An unusual reaction of flavan-3-ols with acetone of relevance to the formation of the tetracyclic ring system in peltogynoids
作者:Jan H. Van Der westhuizen、Jacobus A. Steenkamp、Daneel Ferreira
DOI:10.1016/s0040-4020(01)90082-1
日期:1990.1
Flavan-3-ols are in moist acetone subject to acid-catalyzed incorporation of an 1-methylethylidene fragment between 3-OH and C-2 (B-ring) to give a tetracyclic ring system reminiscent of the peltogynoid series of flavonoids.
The freely rotating single bond between the pyrogallol and chroman substructures in epigallocatechin (EGC) was constrained by reaction of EGC with acetone in the presence of trimethylsilyl trifluor...