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The Pd(II)-catalyzed oxidative [3+2] cycloaddition of N-(2-pyridyl) ketoimines with internal alkynes has been developed. The transformation is tolerant of extensive substitution on halogen, alkene, alkyne, hydroxyl, aryl and acyl groups, and allows facile assembly of multisubstituted pyrroles.
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Xie et al. (2014) studied this question.
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