A Facile and Selective Synthesis of 2-Alkylamino-4(3H)-quinazolinones
摘要:
The carbodiimides 2, obtained from aza-Wittig reactions of iminophosphorane 1 with aromatic isocyanates, reacted with aliphatic primary amines to give mainly 2-alkylamino-4(3H)-quinazolinones 4 with unusual selectivity.
RE[N(SiMe<sub>3</sub>)<sub>2</sub>]<sub>3</sub>-Catalyzed Guanylation/Cyclization of Amino Acid Esters and Carbodiimides
作者:Chengrong Lu、Chao Gong、Bei Zhao、Lijuan Hu、Yingming Yao
DOI:10.1021/acs.joc.7b02550
日期:2018.2.2
The example of rare-earth metal-catalyzed guanylation/cyclization of amino acidesters and carbodiimides is well-established, forming 4(3H)-2-alkylaminoquinazolinones in 65–96% yields. The rare-earth metal amides RE[N(TMS)2]3 (RE = Y, Yb, Nd, Sm, La; TMS = SiMe3) showed high activities, and La[N(TMS)2]3 performed best for a wide scope of the substrates.
Molybdenum-mediated synthesis of quinazolin-4(3H)-ones via cyclocarbonylation using microwave irradiation
作者:Bryan Roberts、David Liptrot、Tim Luker、Michael J. Stocks、Catherine Barber、Nicola Webb、Robert Dods、Barrie Martin
DOI:10.1016/j.tetlet.2011.05.052
日期:2011.7
A new, efficient and practical synthesis of quinazolin-4(3H)-ones is reported via molybdenum-mediated cyclocarbonylation using microwave irradiation. These methods allow access to a wide range of quinazolin-4(314)-ones in reasonable yields without the need for gaseous carbon monoxide and palladium catalysts. A range of reactions illustrating the wide scope of this chemistry was carried out and all proceeded in reasonable yields. (C) 2011 Elsevier Ltd. All rights reserved.