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

Richard P. Hsung, Letitia J. Yao, Christopher D. Morgan et al.|The Journal of Organic Chemistry|1999

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