following scheme i u201c reactant b u201d may be any one of reactants b1 to b5 as listed in table 4 and u201c intermediate c u201d may be any one of foresaid intermediates c1 to c29 the compounds were each synthesized by the following steps reactants b1 to b5 were used to prepare the novel compounds among them reactants b1 to b2 were purchased from aldrich or alfa and cas numbers were listed in table 4 in addition reactants b3 to b5 were synthesized by the scheme i i below reactants b3 to b5 were synthesized by the scheme i i the reactants b3 to b5 can be prepared according to the above scheme i i the starting materials ar 1 nh 2 arylamine and br u2014 ar 2 arylbromide to prepare the reactants b3 to b5 are listed in the following table 5 a mixture of arylbromide 1 0 eq arylamine 1 05 eq pd oac 2 0 01 eq 1 1 u2032 bis diphenylphosphino ferrocene dppf 0 04 eq sodium tert butoxide 1 5 eq and toluene was taken in a pressure tube and heated at 80 u00b0 c for 12h under n 2 atmosphere after completion of the reaction the volatiles were removed under vacuum and the resulting solution extracted with 60 ml dichloromethane for 3 times the combined organic extract was washed with brine solution dried over na 2 so 4 and concentrated to leave a yellow solid further the crude product was purified by column chromatography on silica gel by using hexane dichloromethane mixture 2 1 v v as an eluent the analysis data of the obtained products i e reactants b3 to b5 are listed in the following table 5 intermediate c 1 0 eq and reactant b.