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It is possible to use the cheaper 2-chloro or 2-bromo derivatives with a palladium catalyst containing an electron-rich ferrocenylphosphine ligand, see M. Shen, G. S. Li, B. Z. Lu, A. Hossain, F. Roschangar, V. Farina, C. H. Senanayake, Org. Lett. 2004, 6, 4129-4132.
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Intramolecular heteroannulations of carbamate and urea derivatives have been previously reported, see c
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47
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38049001336
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See the Supporting information for the optimization details
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See the Supporting information for the optimization details.
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48
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Similar cleavage has been previously observed with trifluoroacetate protected indole in another palladium-indolization process, see a A. Arcadi, S. Cacchi, F. Marinelli, Tetrahedron Lett. 1992, 33, 3915-3918;
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Similar cleavage has been previously observed with trifluoroacetate protected indole in another palladium-indolization process, see a) A. Arcadi, S. Cacchi, F. Marinelli, Tetrahedron Lett. 1992, 33, 3915-3918;
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It should be noted that in this case the use of a chloride salt is not required
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It should be noted that in this case the use of a chloride salt is not required.
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55
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