1H and 13C NMR spectral studies of some 4H-3,1-benzoxazin-4-ones and their 2-acylaminobenzoic acid precursors
作者:Alan G Osborne、Zia Goolamali
DOI:10.1016/s1386-1425(99)00206-1
日期:2000.5
The 1H and 13CNMR spectra of twelve 4H-3,1-benzoxazine-4-ones and of their acylaminobenzoic acid precursors are presented. Differentiation between these two series of compounds is best achieved through the characteristic J(CH) coupling interactions in the high frequency carbonyl region. Some 4H-pyrido[2,3-d][1,3]oxazin-4-ones have also been studied and some earlier literature assignments revised.
A FACILE METHOD WITH IMPROVED YIELDS IN THE SYNTHESIS OF 6-ARYLPYRIDO[2′,3′:4,5]PYRIMIDO[1,6-a]BENZIMIDAZOLES
作者:G. Suma、R. H. Bahekar、A. R. R. Rao
DOI:10.1080/00304940009356756
日期:2000.2
work on the synthesis and bronchodilator activity of some new fused quinazolines,’ we carried out the preparation of some fused pyridopyrimidines as isosteres of the quinazoline moiety. A literature survey revealed that the title compounds (4) have been synthesized with overall yields of about 34%.3.4 We now report the preparation of the above compounds by a route analogous to the synthesis of benzimidazoquinazolines