New Reagents for the Synthesis of Triphosphates

　5-Chloro-saligenyl-N,N-diisopropylphosphoramidite (1) and bis(tetrabutylammonium) dihydrogen pyrophosphate (2) are useful reagents for introducing a triphosphate group onto the 5'-end of oligonucleotides. These reagents are applicable to both solid phase synthesis and a standard oligonucleitide synthesizer, and are anticipated to be powerful tools in chemical and biochemical research.