Synthesis and Mechanistic Study of Cyclic Oxoguanidines via Zn(OTf)<sub>2</sub>-Catalyzed Guanylation/Amidation from Readily Available Amino Acid Esters and Carbodiimides
作者:Yue Chi、Ling Xu、Shanshan Du、Haihan Yan、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1002/chem.201500573
日期:2015.7.13
The Zn(OTf)2‐catalyzed guanylation/amidationfromreadilyavailableaminoacidesters and carbodiimides is achieved to provide efficiently various cyclicoxoguanidines, including 2‐amino‐1H‐imidazol‐5(4H)‐ones and 2‐aminoquinazolin‐4(3H)‐ones in medium‐to‐high yields. It is the first time that an ammonium salt has been used in a guanylation reaction. The application of cyclicoxoguanidines to provide
New methodology for the preparation of quinazoline derivatives via tandem aza-wittig/heterocumulene-mediated annulation. Synthesis of 4(3H)-quinazolinones, benzimidazo[1,2-c] quinazolines, quinazolino[3,2-a]quinazolines and benzothiazolo[3,2-c]quinazolines
作者:Pedro Molina、Mateo Alajarín、Angel Vidal
DOI:10.1016/s0040-4020(01)81321-1
日期:1989.1
2-substituted-4(3H)-quinazolinones . Iminophosphoranes also react with carbon disulfide and carbon dioxide to give the quinazolinones and respectively. Iminophosphorane , derived from 2-(o-azidophenyl)benzimidazole, reacts with isocyanates, carbon disulfide and carbon dioxide to form 6-substituted benzimidazo[1,2-c]quinazolines and respectively. In benzene at room temperature, iminophosphorane , reacts