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Despite the fact that the Grubbs' ruthenium carbene complexes show remarkable functional group tolerance, the tolerance is generally poor for amines: a) G. C. Fu, S.-B. T. Nguyen, R. H. Grubbs, J. Am. Chem. Soc. 1993, 115, 9856;
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0037162784
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20744453482
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CCDC-260740 contains the supplementary crystallographic data for this paper. These data can be obtained free of charge from the Cambridge Crystallographic Data Centre via www.ccdc.cam.ac.uk/data_request/cif.
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note
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For the preparation of benzoxazine 7f commercially available (Aldrich) 2-methylallylmagnesium chloride was used.
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note
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The hydrochlorides of 7a-i were obtained by bubbling dry HCl into ethereal solutions of 7a-i for 5 min and removal of the solvent.
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