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Sequential 1,2-Addition−Electrocyclic Ring Closures Involving Acyclic α,β-Unsaturated Iminiums:  A Formal [3 + 3] Cycloaddition Strategy to Unique Pyranyl Spirocycles

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posted on 08.01.1999, 00:00 by Richard P. Hsung, Hong C. Shen, Christopher J. Douglas, Christopher D. Morgan, Shane J. Degen, Letitia J. Yao
Sequential 1,2-Addition−Electrocyclic Ring Closures Involving Acyclic α,β-Unsaturated Iminiums:  A Formal [3 + 3] Cycloaddition Strategy to Unique Pyranyl Spirocycles

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