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14
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84986716703
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For palladium-catalyzed coupling reactions of chloroformate and N,N-dialkylcarbamoyl chloride, see: a) Y. Tohda, K. Sonogashira, and N. Hagihara, Synthesis, 1977, 777;
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21
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0041590063
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note
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16 was added. The mixture was passed through a short pad of silica gel to remove insoluble materials, and the eluent was subjected to preparative thin layer chromatography (silica gel, AcOEt : hexane = 1 : 3) to afford 2g (93.4 mg, 80%).
-
-
-
-
22
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0042592026
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-
note
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4 showed a similar catalytic activity. The use of highly dipolar solvents such as 1-methyl-2-pyrrolidinone and N,N-dimethylformamide gave inferior results, although they have been frequently used in the cross-coupling reactions of organostannanes.
-
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24
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0000766949
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b) M. Kosugi, T. Sumiya, Y. Obara, M. Suzuki, H. Sano, and T. Migita, Bull. Chem. Soc. Jpn., 60, 767 (1987).
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Migita, T.6
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25
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0043092852
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-
note
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2CO, was formed together with the homocoupling product, being suggestive of 1 as an oxidant.
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-
-
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26
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33751386638
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V. Farina, B. Krishnan, D. R. Marshall, and G. P. Roth, J. Org. Chem., 58, 5434 (1993).
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9644285669
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84989498349
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b) S. Takahashi, Y. Kuroyama, K. Sonogashira, and N. Hagihara, Synthesis, 1980, 627.
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