Aqueous Copper Nitrate Catalyzed Synthesis of 3-Alkylideneoxindoles from α-Diazo-β-ketoanilides
作者:Shanyan Mo、Zhanhui Yang、Jiaxi Xu
DOI:10.1002/ejoc.201402206
日期:2014.6
An economical, practical, and green protocol with which to synthesize 3-alkylideneoxindolesfromα-diazo-β-ketoanilides has been developed. The approach employs inexpensive Cu(NO3)2·3H2O as catalyst and environmentally friendly water as solvent, and achieves moderate to excellent yields. The method has good tolerance to a range of N-alkyl and N-aryl groups, including electron-withdrawing and electron-donating
Intramolecular hydrogen bonding-assisted cyclocondensation of α-diazoketones with various amines: a strategy for highly efficient Wolff 1,2,3-triazole synthesis
A catalytic and highly efficient Wolff's cyclocondensation of α-diazoketones with aromatic and aliphatic amines has been realized for the first time by utilizing the strategy of an intramolecular hydrogen bonding-activating carbonyl group. This approach successfully solved the challenging problem of poor condensation efficiency in Wolff 1,2,3-triazole synthesis, and constitutes a powerful method for the synthesis of highly functionalized 1,2,3-triazoles.
Palladium‐Catalyzed Cascade C−H Functionalization/Asymmetric Allylation Reaction of Aryl α‐Diazoamides and Allenes: Lewis Acid Makes a Difference
作者:Min‐Song Wu、Xiao‐Yun Ruan、Zhi‐Yong Han、Liu‐Zhu Gong
DOI:10.1002/chem.202104218
日期:2022.2.21
An achiral Lewis acid enables chiral palladium complex-catalyzed cascade C−H functionalization/asymmetric allylation reaction of aryl α-diazoamides and allenes to give synthetically useful chiral 3,3-disubstituted oxindole derivatives in enhanced yield and enantioselectivity (up to 93 % ee).
Synthesis of 3-Alkoxy/Aryloxy-β-lactams Using Diazoacetate Esters as Ketene Precursors Under Photoirradiation
作者:Jiaxi Xu、Hengzhen Qi、Zhanhui Yang
DOI:10.1055/s-0030-1259485
日期:2011.3
imines from their trans-isomers into syn-isomers under UV irradiation. The reported method represents a metal-free and neutral approach for the synthesis of 3-alkoxy/aryloxy-β-lactams. diazoacetate - imine -ketene- β-lactam - photoirradiation - Staudinger reaction
Photochemical interconversion of some diazo-amides and diazirinecarboxamides
作者:R. A. Franich、G. Lowe、J. Parker
DOI:10.1039/p19720002034
日期:——
photoisomerisation of diazo-compounds by visible light to give diazirines appears to be restricted to α-diazo-amides. Mono- and di-substituted, alkyl- and aryl-diazirinecarboxamides as well as the parent diazirinecarboxamide have been made in this way. The photoisomerisation of the diazirinecarboxamides back to diazo-amides can be effected by irradiation at the frequency of the diazirine absorption band