Abstract
A series of 5-aryl dihydropyrrole was synthesized from the intramolecular cyclization reaction of homopropargyl amine in the presence of AgOAc as catalyst under microwave irradiation reaction conditions. The homopropargyl amine was prepared by the reaction of propargyl bromide with N-tosyl aldimine under a sonochemical Barbier-type reaction condition. Further aromatization reaction of 5-aryl dihydropyrrole in KOtBu/DMSO can afford 2-aryl pyrrole under microwave irradiation reaction conditions.
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Notes
The addition of 1,2-diiodomoethane was used for the activation of metal, and it reacted with Zn powder in situ to generate Lewis acid ZnI2 and ethene.
The ultrasonic cleaning bath (Elma-T490DH, 50 kHz) should be filled with water containing some 3–5 % detergent. In our laboratory, we used Decon 90, which permits much more even cavitation in bath water.
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Acknowledgments
We thank the National Science Council in Taiwan (NSC 101-2113-M-032-003) and Tamkang University for financial support.
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Lee, A.SY., Lee, SH.M. & Chang, YT. Microwave assisted synthesis of dihydropyrrole by AgOAc catalyzed intramolecular cyclization reaction of homopropargyl amine. Res Chem Intermed 43, 3493–3503 (2017). https://doi.org/10.1007/s11164-016-2442-x
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DOI: https://doi.org/10.1007/s11164-016-2442-x