Volume 54, Issue 21 pp. 6320-6324
Communication

Organocatalytic Asymmetric Addition of Naphthols and Electron-Rich Phenols to Isatin-Derived Ketimines: Highly Enantioselective Construction of Tetrasubstituted Stereocenters

Marc Montesinos-Magraner

Marc Montesinos-Magraner

Departament de Química Orgànica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, València (Spain)

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Dr. Carlos Vila

Dr. Carlos Vila

Departament de Química Orgànica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, València (Spain)

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Rubén Cantón

Rubén Cantón

Departament de Química Orgànica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, València (Spain)

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Prof. Dr. Gonzalo Blay

Prof. Dr. Gonzalo Blay

Departament de Química Orgànica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, València (Spain)

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Dr. Isabel Fernández

Dr. Isabel Fernández

Departament de Química Orgànica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, València (Spain)

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Prof. Dr. M. Carmen Muñoz

Prof. Dr. M. Carmen Muñoz

Departament de Física Aplicada, Universitat Politècnica de València, Camino de Vera s/n, 46022 València (Spain)

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Prof. Dr. José R. Pedro

Corresponding Author

Prof. Dr. José R. Pedro

Departament de Química Orgànica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, València (Spain)

Departament de Química Orgànica, Facultat de Química, Universitat de València, Dr. Moliner 50, 46100 Burjassot, València (Spain)Search for more papers by this author
First published: 02 April 2015
Citations: 133

Financial support from the MINECO (Gobierno de España; CTQ2013-47494-P) and from Generalitat Valenciana (ISIC2012/001) is gratefully acknowledged. M.M.-M. thanks the Universitat de València for a predoctoral grant. C.V. thanks MINECO for a JdC contract.

Graphical Abstract

Gentle persuasion: A quinine-derived thiourea organocatalyst was found to promote the asymmetric addition of naphthols and activated phenols to ketimines derived from isatins (see scheme; Boc=tert-butoxycarbonyl). The reaction under mild conditions afforded chiral 3-amino-2-oxindoles containing a quaternary stereocenter in high yields (up to 99 %) with excellent enantioselectivity (up to 99 % ee).

Abstract

A quinine-derived thiourea organocatalyst promoted the highly enantioselective addition of naphthols and activated phenols to ketimines derived from isatins. The reaction afforded chiral 3-amino-2-oxindoles with a quaternary stereocenter in high yields (up to 99 %) with excellent enantioselectivity (up to 99 % ee). To the best of our knowledge, this transformation is the first highly enantioselective addition of naphthols to ketimines.

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