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0042285762
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note
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Mixtures of regio- and stereoisomers are normally obtained in transition metal-catalyzed reductive couplings of acetylenes and allenes. See refs 2d and 3.
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19
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0041784723
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note
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The structure and configuration of compound 3aa were confirmed by single-crystal X-ray crystallography. See Supporting Information for details.
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23
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0001605581
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2O or ROH additives in the Pd-catalyzed reactions, see: (a) Quan, L. G.; Gevorgyan, V.; Yamamoto, Y. J. Am. Chem. Soc. 1999, 121, 3545. (b) Wellace, D. J.; Goodman, J. M.; Kennedy, D. J.; Davies, A. J.; Cowden, C, J.; Ashwood, M. S.; Cotrell, I. F.; Dolling, U.-H.; Reider, P. J. Org. Lett. 2001, 3, 671.
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2O or ROH additives in the Pd-catalyzed reactions, see: (a) Quan, L. G.; Gevorgyan, V.; Yamamoto, Y. J. Am. Chem. Soc. 1999, 121, 3545. (b) Wellace, D. J.; Goodman, J. M.; Kennedy, D. J.; Davies, A. J.; Cowden, C, J.; Ashwood, M. S.; Cotrell, I. F.; Dolling, U.-H.; Reider, P. J. Org. Lett. 2001, 3, 671.
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0043287974
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note
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It was found that 2,4-disubstituted enynes undergo the Pd-catalyzed benzannulation reaction much easier than 1,2,4-trisubstituted enynes. See ref 6a.
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26
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0042786853
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note
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TCPC = [1,2,3,4-tetrakis(methoxycarbonyl)-1,3-butadiene-1,4-diyl]palladium; TTMPP = tris(2,4,6-trimethoxyphenyl)phosphine.
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28
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0041784724
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note
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Significant deuterium scrambling between deuterated terminal acetylenes and eventual proton sources in the presence of transition metals is well documented. See refs 2h and 3a,b.
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29
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0043287971
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note
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4 (5-10 mol %) in THF or toluene (1 M) at 100-120°C;
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30
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0041784705
-
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note
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3P (20 mol %) in THF or toluene (1 M) at 60-80°C;
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31
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0042786852
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note
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2-AlCl, 25 mol %). No formation of benzannulation products was detected under the listed conditions.
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32
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0042786854
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note
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Pd-catalyzed enyne-diyne benzannulation is a regiospecific process. The regiochemistry of this reaction was established previously (see ref 6a). Nonetheless, the regiochemistry of the selected benzannulation product 5h was again confirmed by 2D NMR experiments; see Supporting Information for details.
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