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1-pyrazolines, especially if they bear an electron-withdrawing group at the C3 position. For a recent example of this kind, see: G. Galley, M. Pätzel, P. G. Jones, Tetrahedron 1995, 51, 1631, and references therein.
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85033957624
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note
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5W] groups over oxygen in [3+2] cycloadditions, see refs. [11] and [12b].
-
-
-
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65
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85033958340
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-
note
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Crystallographic data (excluding structure factors) for the structures 8b and 14b reported in this paper have been deposited with the Cambridge Crystallographic Data Centre as supplementary publications no. CCDC-102354 and 102355 respectively. Copies of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB21EZ, UK (Fax: (+44)1223-336-033; e-mail: deposit@ccdc.cam.ac.uk).
-
-
-
-
66
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85033954510
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note
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-1, F(000) = 808, T=293(2)K. Final conventional R = 0.060 for 3211 observed reflections and ωR2 = 0.219 (for all reflections) and 498 variables, GoF = 1.00.
-
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68
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0004101860
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85033969764
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see also ref. [15], p. 254
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b) see also ref. [15], p. 254.
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70
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85033942006
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note
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3/AcOH; see ref. [19a].
-
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71
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85033957116
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note
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At this stage, the enantiomeric purity of compounds 12 was verified by chiral HPLC analysis of derivatives 12b and 12c (ee>98%) on a Chiralcel OD-H column and n-hexane/ethanol (400:1) as eluent. This date confirms the high diastereoselectivity observed in the key [3+2] cycloaddition step of the transformation of 6 into 9.
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For recent reviews on the use of amino alcohols and diamines as chiral auxiliaries, see: a) R. Noyori, M. Kitamura, Angew. Chem. 1991, 103, 34; Angew. Chem. Int. Ed. Engl. 1991, 30, 49;
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