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2
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33750379684
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Ref 1
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For Robinson annulations with β-oxonitriles, see: (a) Ref 1.
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6
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67651137781
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For Robinson annulations with γ-oxonitriles, see: (e) Sobolev, A.; Vos, M.; Zuilhof, H. T.; Sarabèr, C. E.; Jansen, B. J. M.; de Groot, A. Arkivoc 2005, 39.
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0037450403
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(a) Ivancev, W.; Ognyanov, V. I.; Hesse, M. Tetrahedron 1996, 57, 4363.
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23
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0000774224
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f being virtually the only electrophiles with a propensity for reaction on nitrogen: (a) Kawakami, Y.; Hisada, H.; Yamashita, Y. Tetrahedron Lett. 1985, 26, 5835.
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Kawakami, Y.1
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0002135406
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Marsch, M.8
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Sommer, H.10
-
29
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33750370704
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-
Ref 10f
-
Attempts to detect the intermediate acyl ketenimine have not been successful, consistent with their known instability: (a) Ref 10f.
-
-
-
-
30
-
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0037154743
-
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(b) Finnerty, J.; Mitschke, U.; Wentrup, C. J. Org. Chem. 2002, 67, 1084.
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0000872981
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Targets Heterocycl. Syst.
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Alajarín, M.1
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Tover, F.3
-
34
-
-
33750297998
-
-
note
-
Attempts to intercept 2 with acryloyl chloride were not successful.
-
-
-
-
35
-
-
33750346065
-
-
note
-
The N-acylation of 2 with pivaloyl chloride implies that methyl chloroformate acylates first on nitrogen and then on oxygen as shown (Scheme 2).
-
-
-
-
36
-
-
33750322119
-
-
note
-
4), concentrated, and purified by radial chromatography to afford the pure enamide.
-
-
-
-
37
-
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33750312049
-
-
or from the 12 Union Road, Cambridge CB2 1EZ, U.K. (fax +44 1223 336033; or deposit@ccdc.cam.ac.uk.)
-
X-ray crystallography of 8b and 8g confirmed the stereochemical assignment. The authors have deposited the crystallographic data for 8b and 8g with the Cambridge Crystallographic Data Center (CCDC 605398 and 605397, respectively). The supplementary crystallographic data can be obtained free of charge via www.ccdc.cam.ac.uk/conts/retrieving.html or from the Cambridge Crystallographic Data Center, 12 Union Road, Cambridge CB2 1EZ, U.K. (fax +44 1223 336033; or deposit@ccdc.cam.ac.uk.).
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38
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0023582948
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Battaglia, A.; Cainelli, G.; Giacomini, D.; Martelli, G. Panunzio, M. Tetrahedron Lett. 1987, 28, 4347.
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Battaglia, A.1
Cainelli, G.2
Giacomini, D.3
Martelli, G.4
Panunzio, M.5
-
39
-
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33750344533
-
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note
-
The unit cell contains three distinct conformers: the conformer shown in Figure 1, a second similar conformer in which the phenyl group is axial, and a third conformer with a ring-flipped cyclohexane ring in which the phenyl substituent is equatorially oriented. An ORTEP diagram is provided in the Supporting Information.
-
-
-
-
41
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0000203727
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(b) Westerhausen, M.; Wieneke, M.; Ponikwar, W.; Nöth, H.; Schwarz, W. Organometallics 1998, 17, 1438.
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, vol.17
, pp. 1438
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Westerhausen, M.1
Wieneke, M.2
Ponikwar, W.3
Nöth, H.4
Schwarz, W.5
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