The condensation of 4-bromobenzaldehyde with 2-ethoxycarbonyl-3,4-dimethylpyrrole gave Compound 3,which after hydrolyzation,was converted to the corresponding diacid 4.Six bis(oxazoline)compounds were synthesized directly by the diacid reacting with chiral aminoalcohols.
biphenylenebis(dichlorophosphine)was synthesized by reacting phosphorus trichloride with digrignard reagent.Compared with the methods reported in available references,the reaction conditions of this process were mild,and the yield was higher.
