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note
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In an attempt to account for the endo-selectivity in the 1,3-dipolar cycloaddition reaction of nitrone 2a with N-crotonoylsuccinimide (11a) a series of ab initio calculations have been performed using a 3-21G* basis set. The geometry of both 11a-s-cis (total energy = -583.970 au) and 11a-s-trans have been optimized, and it has been found that the former is 5 kcal/mol more stable than the latter. The dihedral angle of the alkene plane relative to the succinimide plane of 11a-s-trans is 24°. A comparison of the approach of 2a to 11a-s-cis leading to endo-12a and exo-12a reveals that for the latter a steric repulsion between the C-phenyl substituent of the nitrone and one of the carbonyls of the succinimide group may account for the former reaction path.
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60
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1542601335
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note
-
We have also tried to use N-crotonoylsuccinimide (11a) as the substrate m Ti-TADDOLate catalyzed Diels-Alder reactions with cyclopentadiene as the reagent, but the Diels-Alder product was formed with low diastereoselectivity.
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(a) Reference 7a and references therein.
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66
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1542496622
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note
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(b) The authors have deposited atomic coordinates for the structure with the Cambridge Crystallographic Data Centre. The coordinates can be obtained, on request, from the Director. Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB2 1EZ, UK.
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