A facile and efficient one-pot synthesis of substituted pyridine-2,4(1H,3H)-diones has been developed. Subjected to N,N-dimethylformamide dimethyl acetal (DMFDMA) in N,N-dimethylformamide at 120 ˚C, a series of acyl(carbamoyl)ketene S,S-acetals were converted into the corresponding substituted pyridine-2,4(1H,3H)-diones in high yields.
Sulfuric Acid-Catalyzed Regioselective Alkylation of Indoles and β-Naphthols with Ketene Dithioacetal-Based Allylic Alcohols
作者:Mang Wang、Shaoguang Sun、Deqiang Liang、Bangyu Liu、Ying Dong、Qun Liu
DOI:10.1002/ejoc.201001487
日期:2011.5
alkylation of indoles with allylicalcohols has been developed. Catalyzed by sulfuric acid (10 mol-%), the reaction between indoles 2 and allylicalcohols 1 based on ketene dithioacetal affords polyfunctionalized indoles 3 in good to excellent yields with high regioselectivities under mild conditions. The catalytic carbon-carbon coupling reaction provides a facile method for the environmentally benign
A Clean, Facile and Practical Synthesis of α-OxoketeneS,S-Acetals in Water
作者:Yan Ouyang、Dewen Dong、Haifeng Yu、Yongjiu Liang、Qun Liu
DOI:10.1002/adsc.200505331
日期:2006.1
A clean, facile and practical synthesis of α-oxoketene S,S-acetals in water has been developed. Catalyzed by tetrabutylammonium bromide (TBAB) at room temperature in water, a range of β-dicarbonyl compounds have been converted to the corresponding α-oxoketene S,S-acetals in very high yields. The catalyst in the aqueous phase can be recycled after the separation of organic products.
Catalytic Synthesis of α-Oxoketene S,S-Acetals in a Wet Ionic Liquid [Bmim]Cl/H2O Homogeneous System
作者:Ping Yu、Yuangang Zu、Yujie Fu、Thomas Efferth
DOI:10.3390/molecules16064500
日期:——
A clean, practical and environmentally friendly synthesis in a homogeneous system has been developed for α-oxoketene S,S-acetals. A mixture of [Bmim]Cl and water was used as medium. The best economical and practical molar ratio of [Bmim]Cl to substrate was 4 to 1. With various types of 1,3-dicarbonyl compounds as substrate, the corresponding α-oxoketene S,S-acetals have been prepared under mild reaction
Domino Reaction of α-Acetyl-α-carbamoyl Ketene Dithioacetals with Vilsmeier Reagents: A Novel and Efficient Synthesis of 4-Halogenated 2(1<i>H</i>)-Pyridinones
A novel and efficient route to 4-halogenated N-substituted 2(1H)-pyridinones has been developed via a one-pot domino process of readily available α-acetyl-α-carbamoyl ketene dithioacetals with Vilsmeier reagents. These 4-halogenated-2(1H)-pyridinones constitute useful intermediates due to the easy elaboration on either the pyridinone core (by the displacement of the halogen atom) or functionality transformation