An Easy Entry into 2-Halo-3-aryl-4(3<i>H</i>)-quinazoliniminium Halides from Heteroenyne-allenes
作者:Vijaya Kumar Naganaboina、Kusum Lata Chandra、John Desper、Sundeep Rayat
DOI:10.1021/ol201372n
日期:2011.7.15
An efficient three-step synthesis of 2-halo-3-aryl-4(3H)-quinazoliniminium halides from commercially available materials is described. Upon reaction with hydrogen halides, generated in situ from a Lewis acid (MX) and trace water, a variety of easily accessible heteroenyne-allenes underwent facile intramolecular cyclization to afford the title compounds in good yields. The method is highly versatile and provides a general way to construct quinazoliniminium ring systems with a variety of different substitutions.
HOUGHTON, P. G.;PIPE, D. F.;REES, CH. W, J. CHEM. SOC. PERKIN TRANS., 1985, N 7, 1471-1479
作者:HOUGHTON, P. G.、PIPE, D. F.、REES, CH. W
DOI:——
日期:——
Houghton, Peter G.; Pipe, David F.; Rees, Charles W., Journal of the Chemical Society. Perkin transactions I, 1985, p. 1471 - 1480
作者:Houghton, Peter G.、Pipe, David F.、Rees, Charles W.
DOI:——
日期:——
A simple aza wittig-mediated pyrimidine annulation reaction
作者:Edward C. Taylor、Mona Patel
DOI:10.1002/jhet.5570280810
日期:1991.12
Treatment of heterocyclic o-aminonitriles and o-aminoesters 1a-5a with dibromotriphenylphosphorane gives iminophosphoranes 1b-5b which undergo a facile aza-Wittig reaction at room temperature with phenyl isocyanate to provide the carbodiimides 1c-5c. Treatment of the latter intermediates with ammonia leads to intramolecular ring closure of the initially formed guanidines to provide the fused 4-aminopyrimidines