Journal of Organic Chemistry p. 4951 - 4957 (1984)
Update date:2022-08-04
Topics:
Chandrasegaran, Srinivasan
Murakami, Akira
Kan, Lou-sing
The phosphotriester method provides a rapid and convenient procedure for synthesizing oligonucleotides.The mechanism has been revealed and intermediates have been identified by 31P NMR methodology.It was found that reaction of a 5'-protected nucleoside 3'-(p-chlorophenyl phosphate) with mesitylenesulfonyl chloride (MSCl) or 1-(mesitylyl-2-sulfonyl)-3-nitro-1,2,4-triazole (MSNT) in anhydrous pyridine yields only two products within 5 min, the sulfonic acid-phosphate mixed anhydride 2 and the (3'-3') symmetrical pyrophosphate tetraester 3 which can be isolated as a mixture.Reaction of 2 and 3 with 3'-O-acetylthymidine yields the phosphotriester dimer <(MeO)2Tr>NpTOAc.The reaction rate and yield of dimers are closely dependent on the presence of catalysts.The reaction finished within minutes when tetrazole or 3-nitro-1,2,4-triazole was used.On the contrary, the reaction completed in hours when imidazole or 1,2,4-triazole was used as catalysts.The possible mechanisms are explored and discussed in detail.
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