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18
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0010375628
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note
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11. The use of carbamate derivatives was necessary in order to prevent the competitive methylation of both sulfur and nitrogen atoms in a further step of the synthesis.
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19
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0010329682
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note
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2, Pd/C, in order to obtain the free amine (which would be transformed into the carbamate derivatives required for cyclization) were unsuccessful.
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21
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0026660464
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b) Palomo, C.; Cabré, F.; Antonia, J.M. Tetrahedron Lett. 1992, 33, 4819.
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22
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8544244902
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14. Recently it has been reported that the use of CAN in a high excess is able to remove the PMP group of the compounds with amine structure (Bravo, P.; Farina, A.; Kukhar, V. P.; Markowski, A. L.; Meille, S. V.; Soloshonok, V. A.; Sorochinski, A. E.; Viaani, F.; Zanda, M.; Zappalà, C. J. Org. Chem. 1997, 62, 3424).
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Bravo, P.1
Farina, A.2
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Markowski, A.L.4
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Sorochinski, A.E.7
Viaani, F.8
Zanda, M.9
Zappalà, C.10
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23
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0010411692
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note
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13C NMR δ 155.8, 141.4, 139.9, 136.3, 129.6, 128.0, 127.8, 127.5, 127.3, 124.2, 66.1, 60.6, 51.6, 31.8, 21.0, 18.2, 17.5.
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25
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0030600167
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b) García Ruano, J.L.; Martín Castro, A.M.; Rodríguez Ramos, J.H. Tetrahedron Lett. 1996, 37, 4569.
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García Ruano, J.L.1
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Rodríguez Ramos, J.H.3
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26
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37049072118
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17. Bravo, P.; Provosi, E.; Masnati, G. J. Chem. Soc., Perkin Trans. I 1989, 1201.
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Bravo, P.1
Provosi, E.2
Masnati, G.3
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27
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0010330837
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note
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13C NMR δ 163.5, 135.8, 128.4, 128.0, 127.8, 67.8, 44.2, 30.6, 19.6, 18.8.
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