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A metal and catalyst free 1,3-dipolar cycloaddition reaction of azomethine imines with internal alkynes has been developed. Various N,N-bicyclic pyrazolidinones could be prepared quickly under microwave irradiation in moderate to excellent yields (up to 96%). A wide range of azomethine imines and electron-deficient internal alkynes were applicable to this reaction. In addition, gram-scale reaction...
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