Palladium-Catalyzed Cyclocarbonylation of <i>o</i>-Iodoanilines with Imidoyl Chlorides to Produce Quinazolin-4(<i>3H</i>)-ones
作者:Zhaoyan Zheng、Howard Alper
DOI:10.1021/ol7029454
日期:2008.3.1
variety of substituted quinazolin-4(3H)-ones were prepared in 63-91% yields by the palladium-catalyzed cyclocarbonylation of o-iodoanilines with imidoyl chlorides and carbon monoxide. The reaction is believed to proceed via in situ formation of an amidine, followed by oxidative addition, CO insertion, and intramolecular cyclization to give the substituted quinazolin-4(3H)-ones.
An effective one-pot three-component route to 4(3H)-quinazolinones from commercially available starting materials is reported. Thus, isatoic anhydride reacted with ammonium acetate or primary amines and aldehydes in the presence of iodine to produce the corresponding quinazolinone derivatives in moderate to good yields.