189153-27-3

Upstream product

• 938-71-6 4-chloro-2-nitrobenzyl chloride 
• 102987-83-7 5′-O-(4,4′-dimethoxytrityl)thymidine-3′-O-[2-cyanoethyl]phosphonate 
• 98796-51-1 5'-O-(4,4'-dimethoxytrityl)-2'-deoxythymidine-3'-O-[O-(2-cyanoethyl)-N,N'-diisopropylphosphoramidite] 

Downstream Products

• 118149-31-8 C₄₃H₄₇N₄O₁₄PS 
• 184773-07-7 C₅₀H₅₁ClN₅O₁₆PS 

Relevant academic research and scientific papers

Synthesis of oligodeoxynucleoside phosphoromonothioates and phosphorodithioates by a phosphotriester method

A phosphotriester method for the synthesis of dithymidine phosphoromonothioates and phosphorodithioates with new S-protecting groups has been investigated. Four of the S-protecting groups possesed catalytic activity, however side reactions occurred during deprotection. The best S- protecting group was 4-chloro-2-nitrobenzyl which could be removed with a minimum of side reactions (0.3 %). The coupling reagent PyFNOP (14) gave protected dithymidine phosphoromonothioate in 96 % yield after 15 rain coupling. Furthermore PyFNOP chemoselectively activates oxygen in nucleoside phosphorodithioate monomers 9 and can be used for the synthesis of oligodeoxynucleoside phosphorodithioates with mixed base sequences.

Solution phase synthesis of dithymidine phosphorothioate by a phosphotriester method using new S-protecting groups

A phosphotriester method for the synthesis of dithymidine phosphorothioates with eight S-protecting groups has been investigated. Three of the S-protecting groups possesed catalytic activity, however side reactions occurred under deprotection. The best S-protecting group was 4- chloro-2-nitrobenzyl which could be removed with a minimum of side reactions (0.3 %). The coupling reagent PyFNOP (11) gave protected dithymidine phosphorothioate in 96 % yield after 15 min coupling.