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For a review of triazolines as aziridine equivalents, see: Semenov, V. P. Russ. J. Org. Chem. 1996, 32, 1576 (Zh. Org. Khim. 1996, 32, 1627).
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Zh. Org. Khim.
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30
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0037070584
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and references therein
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For recent work on the intramolecular cyclization of carbamoyl- and azidoglycals, see: (a) Nicolaou, K. C.; Baran, P. S.; Zhong, Y.-L.; Barluenga, S.; Hunt, K. W.; Kranich, R.; Vega, J. A. J. Am. Chem. Soc. 2002, 124, 2233 and references therein.
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Vega, J.A.7
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32
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3142684335
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note
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While we have encountered no problems in this respect, CAUTION should always be used when heating solutions of azides.
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33
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3142719552
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note
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We believe the acid- and base-lability of the triazoline lead to the requirement for trialkyl orthoformate as a non-basic acid-scavenging solvent.
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34
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0000990695
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For early examples of the photochemical generation of aziridines from triazolines, see: (a) Scheiner, P. J. Org. Chem. 1967, 32, 2022.
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J. Org. Chem.
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Scheiner, P.1
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37
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3142665271
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note
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The solvent specificity and requirement for a quartz reaction vessel are evidence that acetone serves both as solvent and triplet sensitizer for aziridine formation. For a previous example of sensitized photochemical conversion of a triazoline to an aziridine, see ref 12b.
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38
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3142700508
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note
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1H NMR spectra.
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39
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3142756236
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note
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C2 configurations were assigned based on X-ray crystallographic analysis of 4b. The C1 configuration was assigned based on 1H coupling constants.
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40
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0037151613
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Formation of the acetone adduct could also proceed through O-alkylation of acetone followed by rearrangement. We thank Prof. C. Rojas (Barnard College) for bringing this possibility to our attention. See: Zhang, Y.; Reynolds, N. T.; Manju, K.; Rovis, T. J. Am. Chem. Soc. 2002, 124, 9720.
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J. Am. Chem. Soc.
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Zhang, Y.1
Reynolds, N.T.2
Manju, K.3
Rovis, T.4
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43
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3142703428
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note
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Loss of the TBS group during the cycloaddition accounts for the majority of material loss. Optimization is currently under way in the context of identifying an appropriate silyl linker for solid-phase synthesis.
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