1:1 and 1:2 complexes of Bu4NF and BF3·Et2O: Unique properties as reagents for cleavage of silyl ethers
作者:Shun-ichi Kawahara、Takeshi Wada、Mitsuo Sekine
DOI:10.1016/0040-4039(95)02193-0
日期:1996.1
A new method for removal of trialkylsilyl groups from silylethers using Complex A and Complex B, generated from tetrabutylammonium fluoride (TBAF) and BF3·Et2O has been developed. The desilylation by use of these boron complexes is significantly affected by the steric factor on the Si atom and the reagent.
5'-End-modified pentadecadeoxyribonucleotides (15mers) with a sequence complementary to the tat 2nd splicing acceptor region of human immunodeficiency virus type 1 (HIV-1) were prepared and evaluated for anti-HIV-1 activity. The structures of modified 15mers were confirmed by negative ion LSI mass spectroscopy, and the anti-HIV-1 activities were evaluated in vitro by MTT assay using MT-4 cells. While the unmodified 15mer had no activity in our assay system, the 15mers bearing modifications with trityl-type substituents at the 5'-end showed potent anti-HIV-1 activities.
Ogilvie; Beaucage; Entwistle, Journal of Carbohydrates Nucleosides Nucleotides, 1976, vol. 3, # 4, p. 197 - 227
作者:Ogilvie、Beaucage、Entwistle、et al.
DOI:——
日期:——
An organocatalyzed Stetter reaction as a bio-inspired tool for the synthesis of nucleic acid-based bioconjugates
An N-Heterocyclic Carbene (NHC) catalyzed biomimetic Stetterreaction was applied for the first time as a bioconjugation reaction to sensitive nucleoside-type biomolecules to provide original pyrrole linked nucleolipids. A versatile approach allowed the functionalization of thymidine at the three reactive positions (O-5′, O-3′ and N-3) providing a structural diversity oriented synthesis. This strategy