New V-shaped π-scaffolds are constructed by fusing two N-heteroacene units with either a rigid or flexible eight-membered ring. Their crystals exhibit interesting π-π interaction modes, which are dependent on the central connecting units and subs...
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Organocatalytic Asymmetric Domino [3+2]‐Cycloaddition‐Acyl Transfer Reaction between Azomethine Ylides and α‐Nitro‐α,β‐Unsaturated Ketones
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An organocatalytic asymmetric domino [3+2]-cycloaddition-acyl transfer reaction between in situ generated azomethine ylides and α-nitro-α,β-unsaturated ketones has been developed.
Abstract
Herein we have developed an organocatalytic asymmetric domino [3+2]-cycloaddition-acyl transfer reaction between in situ generated azomethine ylides and α-nitro-α,β-unsaturated ketones. The desired penta-substituted pyrrolidine products were obtained in high yields and in moderate to good enantio- and diastereoselectivities. Also, an isomerization reaction in silica gel was performed for the formation of another diastereomer in high yields with retention of enantioselectivities.
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