from readily available N-arylamides and commercial isocyanates was developed. This one-pot procedure involves the chemoselective activation of the secondary amide with Tf2O/2-Br-Pyr, the sequential addition of isocyanate, and cyclization. The mild reaction is general for a wide range of substrates and can be run on a gram scale.
开发了一种从容易获得的N-芳基酰胺和市售异氰酸酯制备2,3-二烷基取代的喹唑啉酮的简便方法。此一锅法涉及用Tf 2 O / 2-Br-Pyr对仲酰胺进行化学选择性活化,依次添加异氰酸酯和环化反应。温和的反应通常适用于多种底物,并且可以克量级进行。
US7595343B2
申请人:——
公开号:US7595343B2
公开(公告)日:2009-09-29
US7838520B2
申请人:——
公开号:US7838520B2
公开(公告)日:2010-11-23
US7868204B2
申请人:——
公开号:US7868204B2
公开(公告)日:2011-01-11
4(3<i>H</i>)-Quinazolinones from the Reaction of<i>N</i>-Arylnitrilium Salts with Isocyanates
作者:Mahmoud Al-Talib、Johannes C. Jochims、Atef Hamed、Quanrui Wang、Abd El-Hamid Ismail
DOI:10.1055/s-1992-26203
日期:——
N-Arylnitrilium salts 1 react with isocyanates 2 to give salts 3 of 4(3H)-quinazolinones 4, from which compounds 4 can be obtained with base. A metathesis of an isocyanate with a nitrilium salt is reported.