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Volumn 69, Issue 7, 2004, Pages 2509-2515

Thermolytic 4-Methylthio-1-butyl Group for Phosphate/Thiophosphate Protection in Solid-Phase Synthesis of DNA Oligonucleotides

Author keywords

[No Author keywords available]

Indexed keywords

PHOSPHATES; REACTION KINETICS; SYNTHESIS (CHEMICAL);

EID: 12144287950     PISSN: 00223263     EISSN: None     Source Type: Journal    
DOI: 10.1021/jo035861f     Document Type: Article
Times cited : (30)

References (38)
  • 19
    • 0006939346 scopus 로고
    • 13C NMR spectrocopies (data shown in Experimental Section and spectra provided as Supporting Information) and used without further purification. (8) (a) Lee, H.-J.; Moon, S.-H. Chem. Lett. 1984, 1229-1232.
    • (1984) Chem. Lett. , pp. 1229-1232
    • Lee, H.-J.1    Moon, S.-H.2
  • 21
    • 1842475869 scopus 로고    scopus 로고
    • note
    • 31P NMR spectra are shown as Supporting Information.
  • 22
    • 1842603479 scopus 로고    scopus 로고
    • note
    • The oxidation reaction is performed using commercial 0.02 M iodine in THF/pyridine/water, whereas the sulfurization reaction is effected using 0.05 M 3H-1,2-benzodithiol-3-one 1,1-dioxide in MeCN as recommended in the literature.24
  • 23
    • 1842527987 scopus 로고    scopus 로고
    • note
    • RP-HPLC analyses are performed with a 5-μm Supelcosil LC-18S column (25 cm × 4.6 mm) under the following conditions: starting from 0.1 M triethylammonium acetate pH 7.0, a linear gradient of 1% MeCN/min is pumped at a flow rate of 1 mL/min for 40 min and then held isocratic for 20 min.
  • 24
    • 1842498871 scopus 로고    scopus 로고
    • note
    • 3c) under similar thermolytic conditions (pH 7.0, 90 °C).
  • 25
    • 1842551245 scopus 로고    scopus 로고
    • note
    • 4OH for 30 min at 25 °C followed by heating the ammoniacal solution for 2 h at 55 °C also results in complete thermolytic cleavage of the 4-methylthio-1-butyl group to generate the dinucleoside phosphodiester 16 or 17 as the major (>99%) product.
  • 29
    • 1842603480 scopus 로고    scopus 로고
    • note
    • 23 led to the development of this mild reduction reaction. Even though the conversion of 19 to 12 went smoothly and near quantitatively (>99%), it should be understood that the reduction reaction has not, as yet, been optimized and thoroughly investigated in terms of potential nucleobase modifications and/or other side reactions that might occur with representative oligonucleotides. Investigations addressing these concerns are currently underway in our laboratory, and our findings on the scope and limitations of this reduction reaction will be reported soon.
  • 30
    • 1842446647 scopus 로고
    • Compound 18 (as its chloride salt) is prepared from the reaction of tetrahydrothiophene with methyl chloroformate. See: Byrne, B.; Lafleur Lawter, L. M. Tetrahedron Lett. 1986, 27, 1233-1236.
    • (1986) Tetrahedron Lett. , vol.27 , pp. 1233-1236
    • Byrne, B.1    Lafleur Lawter, L.M.2
  • 31
    • 1842551244 scopus 로고    scopus 로고
    • note
    • 2O are shown as Supporting Information.
  • 32
    • 1842446649 scopus 로고    scopus 로고
    • note
    • The origin of trace amounts of 20 contaminating 14 is still unclear and is currently under investigation.
  • 33
    • 1842446648 scopus 로고    scopus 로고
    • note
    • Solid-phase synthesis of the fully thioated 20-mer involves replacing the standard 0.02 M solution of iodine in THF/pyridine/water with a 0.05 M solution of 3H-1,2-benzodithiol-3-one 1,1-dioxide in MeCN and performing the capping reaction after the sulfurization step.24
  • 34
    • 1842446645 scopus 로고    scopus 로고
    • note
    • Phosphoramidites 10a-d and the corresponding 2-cyanoethyl deoxyribonucleoside phosphoramidites were used as 0.1 M solutions in dry MeCN in accordance with a standard automated solid-phase oligonucleotide synthesis program executed by a commercial DNA/RNA synthesizer.
  • 35
    • 0001646976 scopus 로고    scopus 로고
    • In agreement with our findings is the relative instability of bis-(S-β-D-glucopyranosidyl-2-thioethyl) 3′-azido-3′ -deoxythymidin-5′-yl phosphate in aqueous media reported earlier by others. See: Schlienger, N.; Périgaud, C.; Gosselin, G.; Imbach, J.-L. J. Org. Chem. 1997, 62, 7216-7221.
    • (1997) J. Org. Chem. , vol.62 , pp. 7216-7221
    • Schlienger, N.1    Périgaud, C.2    Gosselin, G.3    Imbach, J.-L.4


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.