An nBu4NI-catalyzed oxidative cross-dehydrogenative-coupling of β-dicarbonyl compounds with acetone undermild reaction conditions is described. This methodology provides a straightforward pathway to synthesize 2-carbonyl-1,4-diketones and features a simple system, low reaction temperature, and environmental friendliness.
Metal‐Free, DBU‐Mediated, Microwave‐Assisted Synthesis of Benzo[
<i>c</i>
]xanthones by Tandem Reactions of Alkynyl‐1,3‐diketones
作者:Yi‐En Liang、Balaji D. Barve、Yao‐Haur Kuo、Hsu‐Wei Fang、Ting‐Shen Kuo、Wen‐Tai Li
DOI:10.1002/adsc.202001169
日期:2021.1.19
base‐mediated, green, microwave‐assisted efficient preparation of a diverse benzoxanthone library from variety of readily accessible γ‐alkynyl 1,3‐diketones is reported. The synthesis is based on tandem reactions involving intramolecular cyclization, propargyl‐allenyl isomerization, and electrocyclization in onepot. Some of the benzoxanthones are also synthesized by the one‐pot reaction of 1,3‐diketone and
K<sub>2</sub>CO<sub>3</sub>-Catalyzed Synthesis of Chromones and 4-Quinolones through the Cleavage of Aromatic C–O Bonds
作者:Jie Zhao、Yufen Zhao、Hua Fu
DOI:10.1021/ol300908g
日期:2012.6.1
Phenol-derived electrophiles are favorable substrates because phenols are naturally abundant or can be readily prepared from other aromatic compounds. However, the cleavage of aromatic C-O bonds Is a great challenge because of their high energy. K2CO3-catalyzed intramolecular cyclization of 1-(2-alkoxyphenyl)-3-akylpropane-1,3-dlone and 3-(alkylimino)-1-(2-methoxyphenyl)-2-methylpropan-1-one derivatives via the selective cleavage of aromatic C-O bonds Is reported. The corresponding chromone and 4-quinolone derivatives were obtained in reasonable yields.
ANTUS S.; BAITZ-GACS E.; BOROSS F., J. LIEBIGS ANN. CHEM., 1980, NO 8, 1271-1282
作者:ANTUS S.、 BAITZ-GACS E.、 BOROSS F.
DOI:——
日期:——
MURTHY, M. S. R.;RAO, D. V.;RAO, E. V., INDIAN J. PHARM. SCI., 1983, 45, N 3, 131-133