Water Promoted One-pot Three-Step Synthesis of Novel N-Saccharin Isoxazolines/Isoxazoles Using KI/Oxone Under Ultrasonic Activation

Author(s): Hamza Tachallait, Mohsine Driowya, Eleuterio Álvarez, Rachid Benhida, Khalid Bougrin*

Journal Name: Current Organic Chemistry

Volume 23 , Issue 11 , 2019

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Graphical Abstract:


A green and efficient regioselective protocol was developed for the preparation of novel isoxazolines and isoxazoles of N-saccharin derivatives via the water-promoted cycloaddition reaction of nitrile oxides with alkenes and alkynes. It is noteworthy that KI/Oxone/water-promoted one-pot three-component reactions of aldehyde, hydroxylamine hydrochloride, and alkene or alkyne were observed to be very satisfactory. The synthesis of all adducts (4a-j/5a-j) has been carried out by this method with high to excellent yields (70-95%) at 25°C within 30 min, using ultrasonic probe. All the new compounds were thoroughly characterized by spectroscopic techniques and also 5b, 5c and 5f were structurally identified by single-crystal X-ray diffraction methods. X-ray crystallography structure analysis clearly supported the regioselectivity of the cycloaddition reaction.

Keywords: One-pot synthesis, N-saccharin isoxazolines, N-saccharin isoxazoles, green chemistry, ultrasound irradiation, alkynes.

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Year: 2019
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DOI: 10.2174/1385272823666190621115726
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