linkers were synthesized. The effect of the phenanthrene moiety on duplexstability at different positions was investigated. Placement of two phenanthrene residues in opposite positions had a slightly positive effect on duplexstability. This positive effect was further increased, when two phenanthrene pairs were juxtaposed. In contrast, introduction of a single phenanthrene unit opposite to an adenosine
[EN] PROCESS FOR THE PREPARATION OF PHOSPHITYLATION AGENTS<br/>[FR] PROCEDE DE PREPARATION D'AGENTS DE PHOSPHITYLATION
申请人:AVECIA LTD
公开号:WO2004055030A1
公开(公告)日:2004-07-01
A process for the preparation of a compound of formula R1-Y1-P(NR2R3 )2 is provided. The process comprises reacting a compound of formula PX3 with a compound of formula HNR2R3 to form a compound of formula X-P(NR2R3)2; and reacting the compound of formula X-P(NR2R3)2 with a compound of formula R1-Y1-H in the presence of a hydrocarbon solvent to form the compound of formula R1-Y1-P(NR2R3 )2. R1 represents a phosphorus protecting group; R2 and R3 each independently represent an alkyl, preferably a C1-6alkyl, group, or R2 and R3 are joined, together with the N to which they are attached, to form a 5-7 membered ring; Y1 represents O or S, preferably O; and X represents a halogen, preferably Cl. The preferred solvent is toluene.
[EN] PHOSPHITYLATION PROCESS<br/>[FR] PROCEDE DE PHOSPHITYLATION
申请人:AVECIA BIOTECHNOLOGY INC
公开号:WO2004035599A1
公开(公告)日:2004-04-29
A process for the phosphitylation of an alcohol or thiol with a phosphitylation agent in the presence of an activator is provided. The activator has the formula (1): wherein p is 0 or an integer from 1 to 4 and R for each occurrence is a substituent. Preferably X7 is O and p is 0. The activator is commonly employed as a salt complex with an organic base. Preferred alcohols or thiols include nucleosides and oligonucleotides. The process is particularly suited for the synthesis of phosphoramidites.
Triazolyl-functionalized oligonucleotide (ON) analogs have received much attention as potentialantitumor and antiviral agents. The most promising of such analogs are those exhibiting high binding affinity toward native DNA/RNA, since they may prove to be efficient antisense or siRNA agents. To date, relatively few ON analogs with triazole internucleotide linkages have been described. In this paper