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1H NMR spectroscopy. However, the stereochemical outcome of the process, as discussed in the Supporting Information, prompted us to propose a stepwise double-Michael addition sequence, leading to a formal Diels-Alder product such as 3, more than a concerted cycloaddition mechanism.
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1H NMR spectroscopy. However, the stereochemical outcome of the process, as discussed in the Supporting Information, prompted us to propose a stepwise double-Michael addition sequence, leading to a formal Diels-Alder product such as 3, more than a concerted cycloaddition mechanism.
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The relative and absolute configurations of compounds 3 and 6 were assigned by NMR NOE analyses, X-ray crystallography (for compounds 3c and 6n), and by means of TD-DFT calculations of the electronic circular dichroism (ECD) spectra, as described in the Supporting Information. CCDC 726678 (6n) and 726679 (3 c) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via
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The relative and absolute configurations of compounds 3 and 6 were assigned by NMR NOE analyses, X-ray crystallography (for compounds 3c and 6n), and by means of TD-DFT calculations of the electronic circular dichroism (ECD) spectra, as described in the Supporting Information. CCDC 726678 (6n) and 726679 (3 c) contain 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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