3'-O-TBDMS-Guanosine (iBu) CE Phosphoramidite
Oligonucleotide Synthesis, RNA Raw Materials & Modification
Product summary
Quick view
- Product family
- Oligonucleotide Synthesis, RNA Raw Materials & Modification
- MF
- C50H68N7O9PSi
- MW
- 970.2
- Purity
- 99.1% (HPLC)
3'-O-TBDMS-Guanosine (iBu) CE Phosphoramidite is a regioisomeric RNA building block: 5'-O-(4,4'-dimethoxytrityl)-N2-isobutyrylguanosine with a 3'-O-(tert-butyldimethylsilyl) group and a 2'-O-(2-cyanoethyl N,N-diisopropyl)phosphoramidite group. CH65065 is identified by CAS 1445905-51-0, molecular formula C50H68N7O9PSi, molecular weight 970.2, PubChem CID 135742514, and InChIKey JCCWPNDXSMAHGZ-FTZVBZPOSA-N.
Unlike the standard RNA amidite (2'-O-TBDMS, 3'-phosphoramidite), here the silyl group is on the 3'-hydroxyl and the phosphoramidite is on the 2'-hydroxyl. Coupling therefore forms 2'→5' internucleotide linkages. The acid-labile 5'-DMT is removed each cycle, the 3'-O-TBDMS protects the 3'-hydroxyl, and the N2-isobutyryl base group is removed at final deprotection.
Synonyms
5'-O-DMT-3'-O-TBDMS-N2-isobutyrylguanosine 2'-CE phosphoramidite; 2'-phosphoramidite regioisomer
Identity and specifications
| Catalog No. | CH65065 |
| CAS No. | 1445905-51-0 |
| Molecular Formula | C50H68N7O9PSi |
| Molecular Weight | 970.2 |
| PubChem CID | 135742514 |
| InChIKey | JCCWPNDXSMAHGZ-FTZVBZPOSA-N |
| Purity | 99.1% (HPLC) |
Storage conditions
powder 2-8 C protected from light; in solvent -80 C; in solvent -20 C
Technical attributes
- Monomer class
- Regioisomeric RNA CE phosphoramidite
- Nucleobase
- Guanine
- 3'-O protection
- TBDMS
- Coupling position
- 2'-O phosphoramidite
- Packaging
- 25 mg; 50 mg; 100 mg; 250 mg; 500 mg; 1 g; 2 g; 5 g; 10 g; Custom packaging on request
- Physical form
- solid
- Stability
- in solvent 6 months at -80 C; in solvent 1 month at -20 C
Application context
- 2'→5' linkage coupling monomer: the 2'-O-(2-cyanoethyl N,N-diisopropyl)phosphoramidite is the reactive coupling group, so internucleotide bonds form between the 2'-position and the next 5'-hydroxyl (2'→5' linkages).
- 5'-DMT + 3'-O-TBDMS protection: the acid-labile 5'-DMT is removed each cycle, while the 3'-O-TBDMS group protects the 3'-hydroxyl during synthesis.
- N2-isobutyryl base protection: the isobutyryl group masks the guanine exocyclic amine during synthesis and is removed at final deprotection.
Related technical resources
Oligonucleotide Modification
Sugar, base, backbone, terminal, and conjugation modifications for ASO, siRNA, guide RNA, aptamer, and research or labeling oligo projects.
Oligonucleotide Synthesis
Support for modified monomers, supports, sulfurizing reagents, cap analogs, and related oligo synthesis inputs.
Public references
- Sustainability Challenges and Opportunities in Oligonucleotide Manufacturing
Journal of Organic Chemistry, 2021
Product-family technical context
- Solid-phase supports for oligonucleotide synthesis
Current Protocols in Nucleic Acid Chemistry, 2013
Product-family technical context
- Deoxynucleoside phosphoramidites—A new class of key intermediates for deoxypolynucleotide synthesis
Tetrahedron Letters, 1981
Product-family technical context
- Synthesis of deoxyoligonucleotides on a polymer support
Journal of the American Chemical Society, 1981
Product-family technical context
- PubChem Compound 135742514
PubChem · CID 135742514
Frequently Asked Questions
How does this differ from the standard 2'-O-TBDMS-rG(iBu) amidite?
It is the regioisomer: the TBDMS group is on the 3'-hydroxyl and the phosphoramidite is on the 2'-hydroxyl (swapped versus the standard amidite). Coupling through the 2'-phosphoramidite forms 2'→5' internucleotide linkages instead of the usual 3'→5' linkages.
What linkage does this amidite form?
Because the phosphoramidite is on the 2'-position, coupling forms 2'→5' internucleotide linkages.
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