10.1002/anie.201704804
Angewandte Chemie International Edition
COMMUNICATION
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Keywords: Asymmetric catalysis · Cycloaddition · Ion Pairing
Catalysis · Organocatalysis · Oxygen Heterocycles
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[17] We also checked at this point the occurrence of the competitive
background reaction using allenamide 1f. In this case, the reaction
between 1f, 2a and DMDO in toluene at -78ºC provided 4f in 39% yield
after 72h.
[18] The reaction was carried out under these optimal conditions without the
presence of catalyst 3e, isolating 4f in 30% yield after 16h.
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[19] The reaction was carried out on a 1,5 mmol of allene 1f isolating adduct
4f in 62% yield (see supporting information for details).
[19] CCDC 1540881 (4x) and 1540882 (4c) 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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