T3P mediated intramolecular rearrangement of <i>o</i>-aminobenzamide to <i>o</i>-ureidobenzonitrile using isothiocyanates
作者:Sadashivamurthy Shamanth、Sandhya C. Nagarakere、Kunigal S. Sagar、Yatheesh Narayana、Mahesha Mamatha、Kanchugarakoppal S. Rangappa、Mantelingu Kempegowda
DOI:10.1080/00397911.2021.1873384
日期:——
of o-ureidobenzonitriles, from o-aminobenzamides and isothiocyanates using T3P. Here, the conversion of thiourea to urea and amide to nitrile take place simultaneously via unprecedented intramolecularrearrangement. This protocol is operationally facile and offers wide variety of o-ureidobenzonitriles at room temperature in good to excellent yields.
I<sub>2</sub>-Catalyzed transformation of <i>o</i>-aminobenzamide to <i>o</i>-ureidobenzonitrile using isothiocyanates
作者:Sadashivamurthy Shamanth、Nagaraju Chaithra、Mahesha Gurukiran、Mahesha Mamatha、N. K. Lokanath、Kanchugarakoppal S. Rangappa、Kempegowda Mantelingu
DOI:10.1039/d0ob00118j
日期:——
The present work describes an unexpected and unique protocol for the iodine catalysed synthesis of o-ureidobenzonitriles using o-aminobenzamides and isothiocyanates via intramolecular rearrangement.
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