An efficient synthesis of 4-alkyl-2(1H)-quinazolinones and 4-alkyl-2-chloroquinazolines from 1-(2-alkynylphenyl)ureas
摘要:
An efficient synthesis of 4-alkyl-2(1H)-quinazolinones has been achieved by cyclization of 1-(2-alkynylphenyl)ureas (2 R-2 = alkyl) in dichloroethane catalyzed by TfOH. In the case of aryl substitution (2 R-2 = aryl), a mixture of quinazolinone tautomers is obtained in dichloroethane with TFA as co-solvent. Chlorination of the resulting mixture affords 4-alkyl-2-chloro-quinazolines as sole products. (C) 2009 Elsevier Ltd. All rights reserved.
This invention is directed to a compound of Formula I
or a pharmaceutically acceptable salt thereof, wherein R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, and X are as defined herein. The compounds of Formula I are useful as receptor tyrosine kinase (RTK) inhibitors and can be used to treat such diseases as cancer, blood vessel proliferative disorders, fibrotic disorders, mesangial cell proliferative disorders and metabolic diseases.
NHC-Stabilized Gold(I) Complexes: Suitable Catalysts for 6-<i>exo</i>-dig Heterocyclization of 1-(<i>o</i>-Ethynylaryl)ureas
作者:Ana Gimeno、Mercedes Medio-Simón、Carmen Ramírez de Arellano、Gregorio Asensio、Ana B. Cuenca
DOI:10.1021/ol100595s
日期:2010.5.7
3-substituted 1-(o-ethynylaryl)ureas 1 selectively undergo either 6-exo-dig or 5-endo-dig cyclization (to give 4-methylene-3,4-quinazolin-2-ones 2 or indoles 3, respectively) depending on the choice of the metal, ligand, and reaction conditions. The best results (up to 96% yield) in the preparation of the hydroamination products 2 are achieved with the highly bulky NHC-stabilized cationic gold(I) complex
This invention is directed to a compound of Formula I
or a pharmaceutically acceptable salt thereof, wherein R1, R2, R3, R4, R5, R6, R7, and X are as defined herein. The compounds of Formula I are useful as receptor tyrosine kinase (RTK) inhibitors and can be used to treat such diseases as cancer, blood vessel proliferative disorders, fibrotic disorders, mesangial cell proliferative disorders and metabolic diseases.