Synthesis of 3-(2-hydroxy-1-phenylethyl)- and 3-(2-hydroxy-2-phenylethyl)adenine, DNA adducts derived from styrene



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3-(2-Hydroxy-2-phenylethyl)- and 3-(2-hydroxy-1-phenylethyl)adenine, DNA adducts derived from styrene, along with their 9-substituted analogues were prepared by alkylation of 8-bromoadenine with corresponding allyl-protected bromohydrins followed by a new deallylation procedure using tetrakis(triphenylphosphine)palladium catalyzed reductive cleavage by poly(methylhydrosiloxane) in the presence of p-toluenesulphonic acid. This novel procedure proved to be useful for purine derivatives, which were resistant to other deallylation protocols. Structure of positional isomers was assigned using 2D NMR experiments HMBC and HMQC.