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18
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1542441396
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note
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It is worth noting that, unlike cyclocondensation with lithium acetate enolate, cycloaddition with ketene cannot be performed from the mixture imine and the corresponding amino ester, which always accompanies the imine 7a in its preparation. In our hands, the treatment of this mixture with LDA did not provide the pure imine 7a. However, a careful distillation allowed the separation and the pure imine 7a was obtained in 60% yield.
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19
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0028946746
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Browne, M.; Burnett, D. A.; Caplen, M. A.; Chen, L. Y.; Clader, J. W.; Domalski, M.; Dugar, S.; Pushpavanam, P.; Sher, R.; Vaccaro, W.; Viziano, M.; Zhao, H. Tetrahedron Lett. 1995, 36, 2555-2558.
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Burnett, D.A.2
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Chen, L.Y.4
Clader, J.W.5
Domalski, M.6
Dugar, S.7
Pushpavanam, P.8
Sher, R.9
Vaccaro, W.10
Viziano, M.11
Zhao, H.12
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Hashimoto, Y.; Kai, A.; Saigo, K. Tetrahedron Lett. 1995, 48, 8821-8824. Georg, G. I.; Wu, Z. Tetrahedron Lett. 1994, 47, 381-384.
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33845183324
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For reviews: (c) Hart, D. J.; Ha, D. C. Chem. Rev. (Washington, D.C.) 1989, 89, 1447. (d) Ojima, I. Acc. Chem. Res 1995, 28, 383-389 and references cited herein.
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Ha, D.C.2
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and references cited herein
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For reviews: (c) Hart, D. J.; Ha, D. C. Chem. Rev. (Washington, D.C.) 1989, 89, 1447. (d) Ojima, I. Acc. Chem. Res 1995, 28, 383-389 and references cited herein.
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Ojima, I.1
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28
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0026686518
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Ojima, I.1
Habus, I.2
Zhao, M.3
Zucco, M.4
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Sun, C.M.6
Brigaud, T.7
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29
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0025973097
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Jayasinghe, L.R.5
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30
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0026774792
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Qjima, I.; Park, Y. H.; Sun, C. M.; Brigaud, T.; Zhao, M. Tetrahedron Lett. 1992, 33, 5737-5740.
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Qjima, I.1
Park, Y.H.2
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Brigaud, T.4
Zhao, M.5
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31
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1542441398
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note
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The authors have deposited atomic coordinates for this structure with the Cambridge Crystallographic Data Centre. The coordinates can be obtained, on request, from the Director, Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK.
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