Around they go: 1,6-Ene-ynamides undergo highly diastereoselective gold-catalyzed cycloisomerizations that lead to functionalized cyclobutanones or carbonyl compounds with a 2-azabicyclo[3.1.0]hexane subunit, depending on the substitution pattern (Ts=p-toluenesulfonyl).
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Couty et al. (2006) studied this question.
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