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Cu(I)-catalyzed cycloadditions reaction between 6-azidopenicillanates and representative terminal alkynes. Conditions: (a) CuI, Hunig’s base, alkynes 6 or 7, THF, rt, (b) TFA, anisole, CH2Cl2, −5°C. Abbreviation: 2,6-DMP = 2,6-dimethoxylphenyl.
