1. photo-arbuzov reaction but this takes approx 3wks to complete.
2. Reaction with P(OiPr)3, reflux for 13h and then react with HBr, toluene, reflux for 7h (40% yield).
@Yasmin Choaie
4,4'-dichloro-2,2'-bipyridine is not good precursor, Br- or I-derivatives have sufficient reactivity. At first, please visit http://www.molbase.com/en/search.html?search_type=struct&search_sub_type=sub&cc=1144057405&page=2 - your target compound is commercially available (but price is terrible :-) This site also contain info about synthesis routes and sometimes NMR spectra simulation for close analogs.
Organometallic approach in pyridinium range alone, and in phosphorous chemistry as well is too poor ; its combination is real bullshit - and Michael's citation support it meaningful.
Best synthesis you can find in attachment. http://www.sciencedirect.com/science/article/pii/S0040403998006479
This synthesis use expensive Me3SiBr as dealkylating reagent in final stage, but PCl5 in MeCN ( reflux 2-3hrs) is low-cost alternative available anywhere.
If you have troubles in access to original literature, please try http://sci-hub.bz or http://sci-hub.io
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