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15644376393
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0000900117
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20
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0030957009
-
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To the best of our knowledge, only three diprotected amines 1 have previously been prepared and in two cases the nitrogen was part of a heterocyclic base and references 12 and 13 above
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17. To the best of our knowledge, only three diprotected amines 1 have previously been prepared and in two cases the nitrogen was part of a heterocyclic base. See: Zhou, J.; Bouhadir, K.; Webb, T. R.; Shevlin, P. B. Tetrahedron Lett. 1997, 38, 4037-4038 and references 12 and 13 above.
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22
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85038549723
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All novel compounds gave satisfactory microanalysis and/or high resolution mass spectrometry data
-
19. All novel compounds gave satisfactory microanalysis and/or high resolution mass spectrometry data.
-
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23
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0001019782
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20. Henry, J. R.; Marcin, L. R.; McIntosh, M. C.; Scola, P. M.; Harris, G. D.; Weinreb, S. M. Tetrahedron Lett. 1989, 50, 5709-5712.
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0029119899
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21. Fukuyama, T.; Jow, C-K.; Cheung, M. Tetrahedron Lett. 1995, 36, 6373-6374; Fukuyama, T.; Cheung, M.; Jow, C-K.; Hidai, Y.; Kan, T. Tetrahedron Lett. 1997, 38, 5831-5834.
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0342894825
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21. Fukuyama, T.; Jow, C-K.; Cheung, M. Tetrahedron Lett. 1995, 36, 6373-6374; Fukuyama, T.; Cheung, M.; Jow, C-K.; Hidai, Y.; Kan, T. Tetrahedron Lett. 1997, 38, 5831-5834.
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0028868443
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22. Bell, K. E.; Knight, D. W.; Gravestock, M. B. Tetrahedron Lett. 1995, 36, 8681-8684; Decicco, C. P.; Graver, P. Synlett 1997, 529-530; Campbell, J. A.; Hart, D. J. J. Org. Chem. 1993, 58, 2900-2903.
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0028868443
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22. Bell, K. E.; Knight, D. W.; Gravestock, M. B. Tetrahedron Lett. 1995, 36, 8681-8684; Decicco, C. P.; Graver, P. Synlett 1997, 529-530; Campbell, J. A.; Hart, D. J. J. Org. Chem. 1993, 58, 2900-2903.
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Decicco, C.P.1
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33751385362
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22. Bell, K. E.; Knight, D. W.; Gravestock, M. B. Tetrahedron Lett. 1995, 36, 8681-8684; Decicco, C. P.; Graver, P. Synlett 1997, 529-530; Campbell, J. A.; Hart, D. J. J. Org. Chem. 1993, 58, 2900-2903.
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29
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0028069277
-
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N-Boc protected sulfonamides 18 (93% yield) and 19 (86% yield) were prepared from the corresponding sulfonamides according to a literature procedure
-
23. N-Boc protected sulfonamides 18 (93% yield) and 19 (86% yield) were prepared from the corresponding sulfonamides according to a literature procedure: Neustadt, B. R. Tetrahedron Lett. 1994, 35, 379-380.
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Neustadt, B.R.1
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30
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85038549448
-
-
Deprotection of either protecting group in N-diprotected alkene 21 was easy. Boc deprotection using TFA or sulfonamide deprotection using mercaptoacetic acid (according to Fukuyama's procedure reported in reference 18) gave the N-monoprotected alkenes (each in quantitative yield)
-
24. Deprotection of either protecting group in N-diprotected alkene 21 was easy. Boc deprotection using TFA or sulfonamide deprotection using mercaptoacetic acid (according to Fukuyama's procedure reported in reference 18) gave the N-monoprotected alkenes (each in quantitative yield).
-
-
-
-
31
-
-
85038552051
-
-
note
-
δH (CHO) values: 3.47 for cis-26, 3.57 for trans-26.
-
-
-
-
32
-
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33751154457
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0030605184
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27. O'Brien, P.; Poumellec, P. Tetrahedron Lett. 1996, 37, 8057-8058; O'Brien, P.; Poumellec, P. J. Chem. Soc., Perkin Trans. 1 1998, 2435-2441.
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27. O'Brien, P.; Poumellec, P. Tetrahedron Lett. 1996, 37, 8057-8058; O'Brien, P.; Poumellec, P. J. Chem. Soc., Perkin Trans. 1 1998, 2435-2441.
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28. Bhuniya, D.; DattaGupta, A.; Singh, V. K. J. Org. Chem. 1996, 61, 6108-6113; Saravanan, P.; Singh, V. K. Tetrahedron Lett. 1998, 39, 167-170.
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