Ultrasound promoted Staudinger-Aza-Wittig tandem reaction on a monoazido-O-peracetylated-β-cyclodextrin: effect of ultrasound power

Tetrahedron Letters

Volumn 50, Issue 40, 2009, Pages 5582-5584

  Scondo, Alexandre ^b   Dumarçay Charbonnier, Florence ^a   Barth, Danielle ^b   Marsura, Alain ^a  

^a NANCY UNIVERSITÉ   (France)

^b UNIVERSITÉ DE LORRAINE   (France)

Author keywords

[No Author keywords available]

Indexed keywords

AZIDE; BETA CYCLODEXTRIN DERIVATIVE; ISOCYANATE; UREA;

ARTICLE; REACTION ANALYSIS; REACTION TIME; STAUDINGER REACTION; ULTRASOUND; WITTIG REACTION;

EID: 68749084742     PISSN: 00404039     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.tetlet.2009.07.082     Document Type: Article

References (19)

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14. Ultrasound experiments were realized with a BANDELIN-HD2070 generator; frequency 20 KHz; power 70 W.
15. 55 C, 50.78; H, 5.61; N, 1.33. Found: C, 50.69; H, 5.61; N, 1.29.
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19. The HPLC system was a SpectraSystem P1000Xr quaternary pump (Finningan, USA), a SpectraSystem SCM 1000 vacuum membrane degasser, a DDL21 evaporative light-scattering detector (Eurosep, France) and a Rheodyne7125 sample injector with a constant volume loop (10 μL). Chromatograms were acquired with a WINI 10 acquisition card and were recorded on a computer by using WINILAB 2 software (Perichrom, France). The analytical column was an unbounded silica Polaris Si-A column (150 mm × 4 mm, Varian, USA); to increase the column life a Polaris Metaguard guard column (Si-A 5 μ, Varian, USA) was used. The oven used herein was a Gecko 2000 (Cluzeau, France) to set the column temperature at 33 °C. The ELSD was set at 100 °C for evaporation temperature. Compressed air was used as nebulization gas at 2 bars of working pressure. The HPLC flow rate was 1 mL/min. A mixture of methanol/dichloromethane was chosen as eluent and a binary gradient was used. The HPLC column was conditioned for 7 min after each run, thus minimizing variation of the retention times (for other details reported to Ref. 14). Samples were taken every 20 min over 2 h.