“…32 For example, condensation of 2,4-bis(trimethylsilyloxy)-6-methylpyrimidine with 4-5 molar excess of 1,4-dibromobutane leads to a complex mixture of N 1 -and N 3 -mono-as well as to N 1 ,N 3 -disubstituted uracils, the ratio of which depends upon the reaction temperature. 33 As a result, an alternative approach for synthesis of 1-[2-[2-(3,5-dimethylbenzoyl)-4-methylphenoxy]ethyl]-6-methyluracil 25 was needed. Thus treatment of 6-methyluracil (5 molar excess) with bromide 5 in the presence of K 2 CO 3 in DMF (Scheme 1) afforded 25 in a 64% yield following separation from the N 1 ,N 3 -disubstituted product.…”