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Intermediate species D (R ) R1 ) Ph, R2 ) H) was isolated, and several control experiments were carried out under various reaction conditions. However, expected cycloaddition was completed within 1 h (with 91% yield of desired product 3a), when the aforementioned intermediate D was heated in DMF at 100 °C in the presence of catalytic amount (10 mol %) of CuI only. Heating at 100 °C without CuI yielded the desired product 3a (54%) along with the recovery of unreacted intermediate D (41%) even after 14h.
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