Formal [4+2] cycloaddition of cyclobutanones bearing alkyne-cobalt complex at their 3-positions
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Cyclobutanones bearing an alkyne-cobalt complex at their 3-positions reacted with aldehydes to give formal [4+2] cycloadducts by using tin(IV) chloride as a Lewis acid. Highly substituted tetrahydropyrone derivatives were stereoselectively prepared by this method. © 2011 Elsevier Ltd. All rights reserved.
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