A new synthesis of β-keto amides by reduction of Passerini adducts
摘要:
The Passerini reaction between glyoxals, isocyanides and acetic acid forms beta-keto acyloxyamides, which are readily transformed in beta-keto amides by reductive deacetoxylation with zinc. The versatility of this procedure, which allows introducing different groups both in position-3 and the amide nitrogen, makes it ideal for its use in diversity-oriented synthesis. in combination with subsequent complexity generation reactions. (C) 2004 Elsevier Ltd. All rights reserved.
Oxidation of β-Ketoamides: The Synthesis of Vicinal Tricarbonyl Amides
作者:Yueyang Liu、Zhiguo Zhang、Yameng Wan、Guisheng Zhang、Zhonglian Li、Jingjing Bi、Nana Ma、Tongxin Liu、Qingfeng Liu
DOI:10.1021/acs.joc.6b03062
日期:2017.4.7
A facile and direct oxidative reaction for the synthesis of vicinaltricarbonyl amides in moderate to excellent yields (53–88%) was developed starting from readily available β-ketoamides in the presence of phenyliodine(III) bis(trifluoroacetate). The resulting products possess significant synthetic potential, making this approach a valuable addition to the group of traditional methods already available
Silver(I)-Catalyzed Tandem Approach to β-Oxo Amides
作者:Jaya Kishore Vandavasi、Cheng-Tien Hsiao、Wan-Ping Hu、Siva Senthil Kumar Boominathan、Jeh-Jeng Wang
DOI:10.1002/ejoc.201500224
日期:2015.5
A facile and efficient AgI-catalytic approach is reported for the first time to synthesize β-oxoamides from β-oxo esters a with broad substrate scope in good to excellent yields. Crossover and in situ NMR studies confirmed that the reaction occurred through a new pathway and not by the traditional condensation reaction. The key advantages of this method are the readily available starting materials
Selectfluor-Promoted Intramolecular N–S Bond Formation of α-Carbamoyl Ketene Dithioacetals in the Presence of Water: Synthesis of Multifunctionalized Isothiazolones
作者:Zheng Liu、Youkun Wang、Jianfeng Huo、Xiao-Jun Li、Shengnan Li、Xiaoning Song
DOI:10.1021/acs.joc.0c03036
日期:2021.4.16
annulation of α-carbamoyl ketenedithioacetals has been developed in the presence of H2O and metal-free conditions. Notably, the experimental results reveal that H2O was crucial to the formation of new N–S bonds and the elimination of alkyl group from the sulfur atom. This protocol provides readily prepared substrates and possesses good functional group tolerance, mild reaction conditions, and operational
photocatalytic protocol enabling the formation of secondary amides from electron-poor organic bromides and isocyanides was developed. In addition, the in situ interception of ketenimine intermediates with nitrogen nucleophiles such as amines, hydrazines, and TMSN3 afforded, in a one-pot two-step procedure, valuable scaffolds such as ketene aminals, pyrazolones, and tetrazoles. Mechanistic evidence confirmed
annulation reaction of [60]fullerene with diarylethanones, benzoylacetonitriles, and β-dicarbonyl compounds has been developed for the direct construction of diverse disubstituted dihydrofuran-fused [60]fullerenederivatives. This transformation exhibits a remarkably broad substrate scope and functional group tolerance and provides a useful method to a scarce class of fullerenederivatives.