Copper-catalyzed chemoselective cross-coupling reaction of thioamides and α-diazocarbonyl compounds: Synthesis of enaminones
作者:Arpal Pal、Naga D. Koduri、Zhiguo Wang、Erika Lopez Quiroz、Alexandra Chong、Matthew Vuong、Nisha Rajagopal、Michael Nguyen、Kenneth P. Roberts、Syed R. Hussaini
DOI:10.1016/j.tetlet.2017.01.004
日期:2017.2
formation reactions are highly important in pharmaceutical, agrochemical and material research. In this article we describe the first copper-catalyzed cross-couplingreaction of thioamides with acceptor/acceptor-substituted and acceptor-only substituted α-diazocarbonyl compounds to yield enaminones. The reaction shows broad substrate scope in terms of thioamides and diazocarbonyl compounds. Primary
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.
Straightforward synthetic access to α-acyloxy-1,3-dicarbonyl compounds is described via a novel Cu(ii)-catalyzed and isocyanide-assisted formal O–H insertion reaction of α-diazocarbonyl compounds to carboxylic acids.
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
A novel Cu(II)-catalyzed cyclization of alpha-diazo-beta-oxoamides with amines has been developed, constituting a straightforward method to construct pyrrol-3(2H)-one rings. The intramolecular hydrogen bonding effect in alpha-diazo-beta-oxoamides plays an essential role in this reaction. A plausible reaction mechanism involving divergent generation and subsequent [2 + 3] cyclization of ketene and alpha-diazoimine