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For a recent example of preparation of tert-alkyl azides via the Markovnikov addition of an azide anion, see: J. Waser, B. Caspar, H. Nambu, E. M. Carreira, J. Am. Chem. Soc. 2006, 128, 11693.
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For a recent example of preparation of tert-alkyl azides via the Markovnikov addition of an azide anion, see: J. Waser, B. Caspar, H. Nambu, E. M. Carreira, J. Am. Chem. Soc. 2006, 128, 11693.
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For reviews of oxidation-reduction condensation, see: a) T. Mukaiyama, H. Yamabe, Chem. Lett. 2007, 36, 2.
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For oxidation-reduction condensation using azides as oxidant, see: a
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For oxidation-reduction condensation using azides as oxidant, see: a) H. Aoki, K. Kuroda, T. Mukaiyama, Chem. Lett. 2005, 34, 1266.
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The ratio of enantiomer 2e was determined by HPLC analysis after converting the azide to 1,4-disubstituted 1,2,3-triazole on treatment with phenylacetylene in the presence of CuSO4·5H2O and sodium ascorbate.
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The ratio of enantiomer 2e was determined by HPLC analysis after converting the azide to 1,4-disubstituted 1,2,3-triazole on treatment with phenylacetylene in the presence of CuSO4·5H2O and sodium ascorbate.
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Typical experimental procedure is as follows (Table 2, Entry 5): to PhOPPh2 (0.60 mrnol) in dry toluene (0.30 mL) was added tri-methylsilylmethyl azide (0.60 mrnol) at rt under Ar atmosphere. After this mixture was stirred for 20min at 80 °C, alcohol 1f (0.20 mrnol) in dry toluene (0.60 mL) and TMSN3 (0.60 mmol) were added at rt. The reaction mixture was stirred at rt for 48 h and the crude product was purified by preparative TLC to afford the corresponding azide 2f (86% yield).
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Typical experimental procedure is as follows (Table 2, Entry 5): to PhOPPh2 (0.60 mrnol) in dry toluene (0.30 mL) was added tri-methylsilylmethyl azide (0.60 mrnol) at rt under Ar atmosphere. After this mixture was stirred for 20min at 80 °C, alcohol 1f (0.20 mrnol) in dry toluene (0.60 mL) and TMSN3 (0.60 mmol) were added at rt. The reaction mixture was stirred at rt for 48 h and the crude product was purified by preparative TLC to afford the corresponding azide 2f (86% yield).
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