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| the compound of formula II may also be prepared,for example,by acetylation of a compound of the formula:III.Acetylation may be effected by any convenient method e.g.by the use of acetic anhydride(which can also serve as the solvent)together with catalytic amounts of a mineral acid e.g.sulphuric or perchloric acid,or by the use of an acid halide preferably in a polar solvent such as dimethylformamide or dimethylacetamide.where unwanted O-acetyl groupings are formed these may be removed either at this stage or after the hydroxyalkylation of the O-acetylated compound.the basic hydrolysis of the O-acetyl grouping may for example,be effected using aqueous alkali metal hydroxide,the reaction preferably being carried out at slightly elevated temperature,e.g.about 50oC |
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2楼2011-11-27 20:40:16