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Fluorescent 5-Pyrimidine and 8-Purine Nucleosides Modified with an N-Unsubstituted 1,2,3-Triazol-4-yl Moiety.

ABSTRACT: The Cu(I)- or Ag(I)-catalyzed cycloaddition between 8-ethynyladenine or guanine nucleosides and TMSN3 gave 8-(1- H-1,2,3-triazol-4-yl) nucleosides in good yields. On the other hand, reactions of 5-ethynyluracil or cytosine nucleosides with TMSN3 led to the chemoselective formation of triazoles via Cu(I)-catalyzed cycloaddition or vinyl azides via Ag(I)-catalyzed hydroazidation. These nucleosides with a minimalistic triazolyl modification showed excellent fluorescent properties with 8-(1- H-1,2,3-triazol-4-yl)-2'-deoxyadenosine (8-TrzdA), exhibiting a quantum yield of 44%. The 8-TrzdA 5'-triphosphate was incorporated into duplex DNA containing a one-nucleotide gap by DNA polymerase ?.

SUBMITTER: Wen Z

PROVIDER: S-EPMC6800167 | biostudies-literature | 2019 Mar

REPOSITORIES: biostudies-literature

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Fluorescent 5-Pyrimidine and 8-Purine Nucleosides Modified with an N-Unsubstituted 1,2,3-Triazol-4-yl Moiety.

Wen Zhiwei Z Tuttle Paloma R PR Howlader A Hasan AH Vasilyeva Anna A Gonzalez Laura L Tangar Antonija A Lei Ruipeng R Laverde Eduardo E EE Liu Yuan Y Miksovska Jaroslava J Wnuk Stanislaw F SF

The Journal of organic chemistry 20190306 6

The Cu(I)- or Ag(I)-catalyzed cycloaddition between 8-ethynyladenine or guanine nucleosides and TMSN<sub>3</sub> gave 8-(1- H-1,2,3-triazol-4-yl) nucleosides in good yields. On the other hand, reactions of 5-ethynyluracil or cytosine nucleosides with TMSN<sub>3</sub> led to the chemoselective formation of triazoles via Cu(I)-catalyzed cycloaddition or vinyl azides via Ag(I)-catalyzed hydroazidation. These nucleosides with a minimalistic triazolyl modification showed excellent fluorescent propert ...[more]

PMID: 30806513

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Project description:The title compound, C(14)H(17)N(5)O, a 1,2,3-triazole derivative of benzoxadiazole (C(14)H(17)N(5)O), was synthesized via Cu-catal-ysed azide-alkyne cyclo-addition (CuAAC) from the corres-ponding n-octyne and 4-azido-benzoxadiazole. The benz-oxa-diazole and triazole rings show a roughly planar orientation [dihedral angle between the ring planes = 12.18?(5)°]. The alkane chain adopts a zigzag conformation, which deviates from the central triazole ring by 20.89?(6)°. These two torsion angles result in an overall twist to the structure, with a dihedral angle of 32.86?(7)° between the benzoxadiazole group and the hexyl chain. The crystal structure features C-H?N hydrogen bonds leading to chains propagating along [2-10] and offset parallel stacking inter-actions of the triazole and benzoxadiazole rings. The centroid of the extended ?-system formed by the benzoxadiazole and triazole rings (14 atoms total) was calculated; the centroid-centroid distance was 4.179?Å, interplanar separation was 3.243?Å, and the resulting offset was 2.636?Å.

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