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문병조,정현주,김상국,김남희,Mun, Byeong Jo,Jeong, Hyeon Ju,Kim, Sang Guk,Kim, Nam Hui Korean Chemical Society 1996 Bulletin of the Korean Chemical Society Vol.17 No.1
A procedure is described for the synthesis of the title compound via phosphotriester intermediates. The preparation of $R_p$ and $S_p$ diastereomeric dinucleotide of d[Cp(S)T] was performed by the condensation of the protected deoxycytidine, the protected thymidine, 2,5-dichlorophenylphosphorodichloridothioate and 1-hydroxybenzotriazole in THF. Their designation of configuration at phosphorus as $R_p$ and $S_p$ follows from anaylsis of ${31}^P$ NMR spectroscopy and reverse-phase HPLC and the stereospecificity in the hydrolysis catalyzed by Nuclease S1 and snake venom phosphodiesterase. Diastereomerically pure $R_p$ and $S_p$ d[Cp(S)T] were utilized to synthesize oligonucleotides containing the XhoI recognition sequence with a phosphorothioate group at the cleavage site.