Synthesis 2003(8): 1241-1247
DOI: 10.1055/s-2003-39397
PAPER
© Georg Thieme Verlag Stuttgart ˙ New York

Yb(OTf)3-Catalyzed One-Pot Synthesis of Quinazolin-4(3H)-ones from Anthranilic­ Acid, Amines and Ortho Esters (or Formic Acid) in Solvent-Free Conditions

Limin Wang*a, Jianjun Xiaa, Fang Qina, Changtao Qianb, Jie Sunb
a Institute of Fine Chemicals, East China University of Science and Technology, 130 Meilong Lu, Shanghai 200237, P. R. China
Fax: +86(21)64252288; e-Mail: wanglimin@ecust.edu.cn, wcathy@china.com;
b Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 354 Fenglin Lu, Shanghai 200032, P. R. China
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Publikationsverlauf

Received 20 November 2002
Publikationsdatum:
26. Mai 2003 (online)

Abstract

An efficient synthesis of an array of quinazolin-4(3H)-ones from anthranilic acid, ortho esters (or formic acid) and amines using Yb(OTf)3 in one-pot under solvent-free conditions is described. Compared with the classical reaction conditions, this new synthetic method has the advantage of excellent yields (75-99%), shorter reaction time (few minutes) and reusability of the catalyst.