Synlett 2018; 29(07): 912-917
DOI: 10.1055/s-0036-1591544
letter
© Georg Thieme Verlag Stuttgart · New York

Metal-Free Oxidative C(sp3)–N Coupling by HBr and DMSO: A Novel Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones

Narjes Rezaei
School of Chemistry, College of Science, University of Tehran, PO Box 14155-6455, Tehran, Iran   eMail: parvizrashidi2@ut.ac.ir
,
Ehsan Sheikhi
School of Chemistry, College of Science, University of Tehran, PO Box 14155-6455, Tehran, Iran   eMail: parvizrashidi2@ut.ac.ir
,
Parviz Rashidi Ranjbar*
School of Chemistry, College of Science, University of Tehran, PO Box 14155-6455, Tehran, Iran   eMail: parvizrashidi2@ut.ac.ir
› Institutsangaben

This research was supported by the Research Council of the University of Tehran.
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Publikationsverlauf

Received: 21. November 2017

Accepted after revision: 16. Januar 2018

Publikationsdatum:
15. Februar 2018 (online)


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Abstract

A metal-free oxidative C(sp3)–N coupling process has been developed for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones. The reaction between primary amines, isatoic anhydride, and benzylic alcohols in the presence of HBr in DMSO at 80 °C affords 2,3-dihydroquinazolin-4(1H)-ones in excellent yields. Under these reaction conditions, benzylic alcohols react with in situ generated bromodimethylsulfonium bromide to form alkoxysulfonium intermediates. These intermediates undergo an oxidative cyclization reaction with primary amines and isatoic anhydride to produce the title products.