中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 2',4'-bis(4-chlorobenzoyloxy)acetophenone | 22609-50-3 | C22H14Cl2O5 | 429.256 |
Six flavonoid 7- O-β-D-glycosides 1a-3a and 1b–3b were synthesised from the flavones 7a and 7b by glycosidation and deacetylation with the corresponding α-acetylglycosyl bromides. 7a and 7b were prepared in high yield by an improved Baker-Venkataraman rearrangement using 2, 4-dihydroxyacetophenone as starting material and tetrabutylammonium bromide (TBAB) as a phase transfer catalyst. The glycosidation procedure was modified by using anhydrous K2CO3 in a solvent mixture of DMF/acetone (3:2v/v) and TBAB as a phase transfer catalyst.