1,3,2-Benzoxathiaphosphole, hexahydro-3a-methyl-6-(1-methylethenyl)-2-[(2,3,4,5,6-pentafluorophenyl)thio]-, 2-sulfide, (2S,3aS,6R,7aS)-

Air- and moisture-tolerant, this (-)-PSI Reagent was developed in the Baran lab for stereocontrolled synthesis of phosphorothioate oligonucleotides. The enantiomer, (+)-PSI Reagent, is also available (cat# ALD00604).
The PSI Reagents open access to thiophosphate-based nucleotide molecules with therapeutic promise as demonstrated by the Baran lab in the preparation of pure stereoisomers of cyclic dinucleotides (CDNs) and antisense oligonucleotides (ASOs).