α-Nitro-α,β-Unsaturated Ketones: An Electrophilic Acyl Transfer Reagent in Catalytic Asymmetric Friedel–Crafts and Michael Reactions
作者:Chandrakanta Parida、Rajendra Maity、Subas Chandra Sahoo、Subhas Chandra Pan
DOI:10.1021/acs.orglett.9b02310
日期:2019.9.6
α-nitro-α,β-unsaturated ketones as efficient electrophilic acyl transfer reagents, and they were employed in Friedel-Crafts as well as in Michael reactions. The desired acyl transfer products of these reactions were obtained in high yields with high to excellent enantioselectivities with t-leucine-derived squaramide catalyst under mild reaction conditions. Few applications including a synthesis of the isoxazoline
Reactions of 1-amino-2-nitroguanidine with 2-aryl(hetaryl)-1-nitro-1-ethoxycarbonyl(benzoyl)ethenes
作者:T. P. Efimova、O. Yu. Ozerova、T. A. Novikova、R. I. Baichurin、V. M. Berestovitskaya
DOI:10.1134/s1070363214080088
日期:2014.8
Reactions of 1-amino-2-nitroguanidine with 2-aryl(hetaryl)-1-nitro-1-ethoxycarbonyl(benzoyl)-ethenes proceed via initial formation the aza-Michael product, are accompanied by liberation of nitroacetic ester (or nitroacetophenone), and result in N-aryl(hetaryl)methylidene-N-(2-nitroguanidino)amines.
Highly stereoselective synthesis of 2,3-dihydrofurans <i>via</i> a cascade Michael addition-alkylation process: a nitro group as the leaving group
作者:Yiran Mo、Siyang Liu、Yingying Liu、Ling Ye、Zhichuan Shi、Zhigang Zhao、Xuefeng Li
DOI:10.1039/c9cc01509d
日期:——
The Michael addition-alkylation process between gem-benzoyl-nitrostyrenes and 1,3-dicarbonyl compounds proceeded smoothly in the presence of a bifunctional squaramide, exclusively providing 2,3-dihydrofurans as trans-diastereomers in 33–92% isolated yields and excellent enantioselectivities (29–>99% ee).
Synthesis of Dihydrobenzothiazepines Based On 1-acyl-2-heteryl-1-nitroethenes
作者:Ruslan I. Baichurin、Sergey V. Makarenko
DOI:10.1007/s10593-021-03006-1
日期:2021.9
The reactions of thiophene- and N-benzylindole-containing gem-acetylnitroethenes with 2-aminobenzothiol lead to the formation of 4-methyl-3-nitro-2,3-dihydro-1,5-benzothiazepines. At the same time, only S-adducts were formed in the reactions of gembenzoylnitroethenes containing a thiophene, furan, or N-benzylindole substituent with 2-aminobenzothiol.
Synthesis of aryl- and heteryl-containing gem-acylnitrocyclohexenes
作者:R. I. Baichurin、N. I. Aboskalova、G. A. Berkova、V. M. Berestovitskaya
DOI:10.1134/s1070428009080120
日期:2009.8
Reactions of 2-aryl(heteryl)-1-acetyl(benzoyl)-1-nitroethenes with 2,3-dimethyl-1,3-butadiene led to the formation of products of [4+2]-cycloaddition, 1-acyl-6-aryl(heteryl)-3,4-dimethyl-1-nitro-3-cyclohexenes. Their structure was proved by IR and H-1 NMR spectroscopy.