Thermolabile phosphorus protecting groups, associated intermediates and methods of use
申请人:——
公开号:US20010044529A1
公开(公告)日:2001-11-22
The invention provides a method of thermally deprotecting the internucleosidic phosphorus linkage of an oligonucleotide, which method comprises heating in a fluid medium at a substantially neutral pH. The preferred protecting group is of the formula:
1
wherein R
1
is H, R
1a
, OR
1a
, SR
1a
or NR
1a
R
1a′
, wherein R
1a
and R
1a′
independently represent H, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, or aralkyl substituents. Alternatively, NR
1a
R
1a′
represents a heterocycle. X is O or S. Z is O, S, NR
2a
, CR
2a
R
2a′
or CR
2a
R
2a′
CR
2b
R
2b′
wherein R
2a
, R
2a′
, R
2b
and R
2b′
independently represent H, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, or aralkyl substituents. Alternatively, R
1a
or R
1a′
, in combination with any of R
2a
, R
2a′
, R
2b
or R
2b′
, together with C═X can comprise a ring. R
2
, R
2′
, R
3
and R
3′
each represent H, alkyl, alkenyl, alkynyl, cycloalkyl, aryl, or aralkyl substituents. Alternatively, R
2
or R
2′
, in combination with R
3
or R
3′
, together with the carbons to which they are bonded, comprise a benzo-fused bicyclic ring. The foregoing substituents can be unsubstituted or substituted.
The present invention further provides a method of synthesizing an oligonucleotide using the thermal deprotection method described above, and novel oligonucleotides and intermediates that incorporate the thermolabile protecting group used in accordance with the present invention.
该发明提供了一种热解保护核苷酸寡聚物中核苷酸间磷酸酯连接的方法,该方法包括在基本中性pH值下在流体介质中加热。首选的保护基的化学式如下:其中R1为H,R1a,OR1a,SR1a或NR1aR1a′,其中R1a和R1a′独立表示H,烷基,烯烃基,炔烃基,环烷基,芳基或芳基烷基取代基。另外,NR1aR1a′表示杂环。X为O或S。Z为O,S,NR2a,CR2aR2a′或CR2aR2a′CR2bR2b′,其中R2a,R2a′,R2b和R2b′独立表示H,烷基,烯烃基,炔烃基,环烷基,芳基或芳基烷基取代基。另外,R1a或R1a′,与R2a,R2a′,R2b或R2b′中的任何一个结合,连同C═X可以构成一个环。R2,R2′,R3和R3′各自表示H,烷基,烯烃基,炔烃基,环烷基,芳基或芳基烷基取代基。另外,R2或R2′,与R3或R3′结合,连同它们结合的碳原子,构成一个苯并螺环。上述取代基可以是未取代或取代的。本发明还提供了一种使用上述热解保护方法合成寡核苷酸的方法,以及根据本发明采用的热敏保护基的新型寡核苷酸和中间体。