Some observations relating to the use of 1-aryl-4-alkoxypiperidin-4-yl groups for the protection of the 2′-hydroxy functions in the chemical synthesis of oligoribonucleotides
作者:Wayne Lloyd、Colin B. Reese、Quanlai Song、Anthony M. Vandersteen、Cristina Visintin、Pei-Zhou Zhang
DOI:10.1039/a908149f
日期:——
The comparative rates of acid-catalysed removal of ten 1-aryl-4-methoxypiperidin-4-yl 8 (RÂ =Â Me) [including the previously reported Ctmp 5 and Fpmp 6] protecting groups for the 2â²-hydroxy functions in oligoribonucleotide synthesis are discussed. These studies have led to the development of the 1-(4-chlorophenyl)-4-ethoxypiperidin-4-yl (Cpep) protecting group 8 (RÂ =Â Et, R1Â =Â R2Â =Â H, R3Â =Â Cl) which is both more stable than the Ctmp and Fpmp groups at pH 0.5 and more labile at pH 3.75. The influence of the ribonucleoside aglycone on the stability of the 2â²-O-Fpmp and 2â²-O-Ctmp protecting groups both at low and high pH is examined.
讨论了在寡核苷酸合成中,十个1-芳基-4-甲氧基哌啶-4-基(R = Me,包括先前报道的Ctmp 5和Fpmp 6)保护基对2'-羟基功能的酸催化去除的相对速率。这些研究导致开发了1-(4-氯苯基)-4-乙氧基哌啶-4-基(Cpep)保护基8(R = Et,R1 = R2 = H,R3 = Cl),其在pH 0.5下比Ctmp和Fpmp群更加稳定,而在pH 3.75下更加不稳定。研究了核苷酸基在低pH和高pH下对2'-O-Fpmp和2'-O-Ctmp保护基稳定性的影响。