Synthesis 2019; 51(11): 2387-2396
DOI: 10.1055/s-0037-1612253
paper
© Georg Thieme Verlag Stuttgart · New York

Activation of Primary Amines by Copper(I)-Based Lewis Acid Promoters in the Solventless Synthesis of Secondary Propargylamines

Authors

  • Cristina Cimarelli  *

    a   School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino, Italy   Email: cristina.cimarelli@unicam.it
  • Federica Navazio

    a   School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino, Italy   Email: cristina.cimarelli@unicam.it
  • Federico V. Rossi

    a   School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino, Italy   Email: cristina.cimarelli@unicam.it
  • Fabio Del Bello

    b   School of Pharmacy, Medicinal Chemistry Unit, University of Camerino, Via S. Agostino 1, 62032 Camerino, Italy
  • Enrico Marcantoni

    a   School of Science and Technology, Chemistry Division, University of Camerino, Via S. Agostino 1, 62032 Camerino, Italy   Email: cristina.cimarelli@unicam.it

This work was carried out under the framework of the University Research Project ‘Chemical Swiss tools to treat tumors, metastases and infections’ supported by the University of Camerino (FAR 2014-2015).
Further Information

Publication History

Received: 12 November 2018

Accepted after revision: 24 January 2019

Publication Date:
11 March 2019 (online)


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Abstract

Primary amines are activated by copper(I)-based Lewis acid promoters in an A3-coupling one-pot solventless reaction with aldehydes and phenylacetylene for the synthesis of secondary propargylamines. The reaction is promoted by a CuSO4/NaI system, a practical precursor of the in situ generated effective CuI/I2 system, that worked well, but only in a restricted number of examples. Substitution of I2 with CeCl3·7H2O in a one-pot two-step reaction provided good yields and a wider applicability, with the added value given by a safer procedure.

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