Synthesis of {2,3-Dihydro-7-halopyrrolo-[(2,1-<u>b</u>)]-quinazolin-9-(1H)-one and 2,3-Dihydro-5,7-dihalopyrrolo-[(2,1-<u>b</u>)]-quinazolin-9-(1H)-one}: New Analogs of Deoxyvasicinone
作者:Babatunde Ojo、Bejoy K. Chowdhury
DOI:10.1080/00397911.2010.534228
日期:2012.4.1
A series of novel halogen-substituted deoxyvasicinone 2,3-dihydro-7-halopyrrolo-[( 2,1-(b) under bar)]-quinazolin-9-(1H)-one and 2,3-dihydro-5,7-dihalopyrrolo-[(2,1-(b) under bar)]-quinazolin-9-(1H)-one} derivatives was synthesized by condensation of halogenated anthranilic acids (2, 3, 4, 5) with 4-aminobutyric acid (6) in refluxing m-xylene over phosphorus pentoxide for 3 h to give the desired compounds (7a-7d).
Selective copper(II) acetate and potassium iodide catalyzed oxidation of aminals to dihydroquinazoline and quinazolinone alkaloids
作者:Matthew T Richers、Chenfei Zhao、Daniel Seidel
DOI:10.3762/bjoc.9.135
日期:——
acetate/acetic acid/O2 and potassium iodide/tert-butylhydroperoxide systems are shown to affect the selective oxidation of ring-fused aminals to dihydroquinazolines and quinazolinones, respectively. These methods enable the facile preparation of a number of quinazoline alkaloid natural products and their analogues.