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A novel reductive cyclization of o-nitrobenzamides and ketones promoted by low-valent titanium reagent

✍ Scribed by Da-Qing Shi; Liang-Ce Rong; Ju-Xian Wang; Qi-Ya Zhuang; Shu-Jianga Tu

Publisher: John Wiley and Sons
Year: 2010
Tongue: English
Weight: 405 KB
Volume: 22
Category: Article
ISSN: 0256-7660
DOI: 10.1002/cjoc.20040220725

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✦ Synopsis

Abstract

A short and facile synthesis of a series of 1, 2‐dihydroquiazolin‐4(3H)‐ones was accomplished in good yields via novel reductive cyclization of o‐nitrobenzamides with ketones promoted by TiCl~4~/Zn system. The structure was established on the basis of elemental analysis, IR, 'H NMR and confirmed by a single‐crystal X‐ray diffraction analysis. This method has the advantages of easily accessible starting materials, convenient manipulation and moderate to high yields.

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