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.
Facile preparation of acetals and enol ethers derived from 1-arylpiperidin-4-ones
作者:Montserrat Faja、Colin B. Reese、Quanlai Song、Pei-Zhuo Zhang
DOI:10.1039/a606191e
日期:——
When primary aromatic amines 6 are heated under reflux with slight
excesses each of crude 1,5-dichloropentan-3-one 4 and toluene-4-sulfonic
acid monohydrate in dry methanol solution, and an excess of trimethyl
orthoformate is then added to the reactants, the corresponding
1-arylpiperidin-4-one dimethyl acetals 9 are obtained in good
(74–81%) overall yields. The dimethyl acetals 9 undergo hydrolysis in
formic acid–water (9∶1 v/v) at room temperature to give the
parent 1-arylpiperidin-4-ones 8 in virtually quantitative yields. When the
dimethyl acetals 9 are allowed to react with an excess each of
N,N-diisopropylethylamine and boron trifluoride–diethyl
ether complex in dichloromethane solution at 0 °C they are
converted in good yields into the corresponding enol ethers 10, which are
required as reagents in the solid phase synthesis of
oligoribonucleotides.
Protection of hydroxy function with 1-N-aryl-4-alkoxy-piperidin-4-yl
申请人:Kings College London
公开号:US05436331A1
公开(公告)日:1995-07-25
A process for protecting the 2'-hydroxyl of a nucleoside, which can then be used in the chemical synthesis of polyribonucleotides, comprising the reacting of a protected nucleoside of formula I ##STR1## wherein B is a nucleoside heterocyclic base and R' is a hydroxyl-protecting group, with 1-N-aryl-4-alkoxy-1,2,5,6-tetrahydropiperidine of formula II ##STR2## wherein Ar is an aryl group possessing an electron-withdrawing substituent which renders said protecting group acid labile and R is C.sub.1 -C.sub.4 alkyl, in the presence of an acid catalyst and a solvent to yield the compound of formula II below: ##STR3##
Solid phase synthesis of the 3′-terminal nonadecaribonucleoside octadecaphosphate sequence of yeast alanine transfer ribonucleic acid
作者:T.Sudhakar Rao、Colin B. Reese、Halina T. Serafinowska、Hiroshi Takaku、Giovanni Zappia
DOI:10.1016/s0040-4039(00)96655-3
日期:1987.1
The rapid synthesis of the 3′-terminal decaribonucleoside nonaphosphate and nonadecaribonucleoside octadecaphosphate sequences of yeast tRNAAla by the phosphoramidite approach on controlled pore glass is described; the synthetic products were found to be identical to the authentic oligoribonucleotides, prepared by the phosphotriester approach in solution.