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|Title:||Cyclic enecarbamates as precursors of α,β-unsaturated iminium ions: reactivity and synthesis of 6,6-spirocyclic ring systems|
|Other Titles:||Cyclic enecarbamates as precursors of alpha,beta-unsaturated iminium ions: reactivity and synthesis of 6,6-spirocyclic ring systems|
|Citation:||Journal of Organic Chemistry, 2016; 81(21):10366-10375|
|Publisher:||American Chemical Society|
|Zhanwei Wang, Niels Krogsgaard-Larsen, Benjamin Daniels, Daniel. P. Furkert and Margaret A. Brimble|
|Abstract:||The scalable synthesis of cyclic enecarbamates and their use as convenient precursors of α,β-unsaturated N-acyl iminium ions is reported. The newly developed route overcomes synthetic and reactivity difficulties in previously reported methods, is readily scaled up, and proceeds through stable intermediates suitable for long-term storage if required. Preliminary investigations probing the reactivity of cyclic α,β-unsaturated N-acyl iminium ions as dienophiles in Diels-Alder reactions and electrophilic alkylating agents are described. In the presence of Lewis and Brønsted acids, iminium precursor 22a underwent efficient Diels-Alder cycloaddition with a range of simple and complex dienes, culminating in the synthesis of 6,6-spirocyclic ring systems possessing the same relative stereochemistry as the spirocyclic imine present in the marine natural product gymnodimine 1.|
|Rights:||© 2016 American Chemical Society|
|Appears in Collections:||Aurora harvest 3|
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