Fluorine-containing heterocycles: XIX. Synthesis of fluorine-containing quinazolin-4-ones from 3,1-benzoxazin-4-ones
摘要:
Reactions of fluorine-containing 3,1-benzoxazin-4-ones with ammonium acetate, hydrazine, and heteroaromatic amines gave new 3H-, 3-amino-, and 3-hetarylquinazolin-4-ones, respectively. Differences in the conditions of formation of benzoxazinones from anthranilic acids with different fluorination patterns and in the reactions of fluorinated 3,1-benzoxazinones with nitrogen-centered nucleophiles were revealed.
Fluorine-containing heterocycles: XIX. Synthesis of fluorine-containing quinazolin-4-ones from 3,1-benzoxazin-4-ones
摘要:
Reactions of fluorine-containing 3,1-benzoxazin-4-ones with ammonium acetate, hydrazine, and heteroaromatic amines gave new 3H-, 3-amino-, and 3-hetarylquinazolin-4-ones, respectively. Differences in the conditions of formation of benzoxazinones from anthranilic acids with different fluorination patterns and in the reactions of fluorinated 3,1-benzoxazinones with nitrogen-centered nucleophiles were revealed.
(Thio)urea-mediated benzoxazinone opening: mild approach towards synthesis of o-(substituted amido)benzamides
作者:Roshna V. Nair、Gangadhar J. Sanjayan
DOI:10.1039/c3ra45903a
日期:——
C-terminal activation of N-acylated o-aminobenzoic acids and their derivatives during coupling reactions with amines would often pose a challenge due to the formation of a benzoxazinone intermediate, which may resist reacting with amines. This communication reports a mild approach towards the installation of an amide bond via benzoxazinone ring opening utilizing Schreiner's (thio)urea organocatalyst.
在与胺的偶联反应中,N-酰化邻氨基苯甲酸及其衍生物的 C 端活化通常会由于苯并恶嗪酮中间体的形成而面临挑战,该中间体可能会抵制与胺的反应。本研究报告介绍了一种温和的方法,即利用 Schreiner 的(硫)脲有机催化剂,通过苯并恶嗪酮开环来安装酰胺键。
Quinolinone derivatives as inhibitors of c-fms kinase
申请人:Wall J. Mark
公开号:US20050049274A1
公开(公告)日:2005-03-03
The invention is directed to compounds of Formulae I and II:
wherein R
1
, R
2
, R
3
, R
5
, R
6
, Y
1
, Y
2
, Y
3
, Y
4
and X are set forth in the specification, as well as solvates, hydrates, tautomers or pharmaceutically acceptable salts thereof, that inhibit protein tyrosine kinases, especially c-fms kinase.
The synthesis of benzoxazin-4-ones by palladium-catalyzed reductive double carbonylation of nitroarenes with aryl halides has been achieved. The key to success was the use of Mo(CO)6 as a reductant and bench-stable solid carbonyl source. Various aryl iodides, bromides, and trifluoromethanesulfonates are suitable reaction partners and produce corresponding nitrogen heterocycles in moderate to good yields