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33444457329
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note
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Bromoallene 1a contained trace to notable amounts of bromopropargyl ketone 4a, from which it was obtained. Under reaction conditions, 4 underwent rapid isomerization to 1. The same applies to iodoallene 1i (see Table 2). Facile propargyl-allenyl isomerization of propargyl ketones in the presence of gold catalyst was previously observed by Hashmi; see ref 12c.
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20
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33444471656
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note
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See Supporting Information for details.
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For Au-catalyzed synthesis of heterocycles, see: (c) Hashmi, A. S. K.; Schwarz, L.; Choi, J.-H.; Frost, T. M. Angew. Chem., Int. Ed. 2000, 39, 2285.
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For 1,2-hydride shift in Au- and Pt-carbenoid intermediates, see, for example: (a) Fürstner, A.; Stelzer, F.; Szillat, H. J. Am. Chem. Soc. 2001, 123, 11863.
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0035819945
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This is in striking contrast to cycloisomerization of alkynyl imines, where significant loss of deuterium was observed. See: Kel'in, A. V.; Sromek, A. W.; Gevorgyan, V. J. Am. Chem. Soc. 2001, 123, 2074.
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39
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0000706688
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Decrease in regioselectivity of deuterium versus bromine migration is explained by the isotope effect analogous to that observed by Hashmi in the Pd-catalyzed cycloisomerization of allenyl ketones. See: Hashmi, A. S. K.; Ruppert, T. L.; Knöfel, T.; Bats, J. W. J. Org. Chem. 1997, 62, 7295.
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33444471912
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note
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3-catalyzed propargyl-allenyl isomerization (see ref 9) is responsible for partial incorporation of deuterium in position 3 of rf-2k (4 for rf-3k).
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41
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33444474202
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note
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Much more sluggish reaction of 1j is in accordance with decreased ability of the Cl atom to form halirenium species b (Scheme 1).
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