Metal substituted diazo esters as substrates for cross coupling reactions
作者:Albert Padwa、Marcus M. Sá、M. David Weingarten
DOI:10.1016/s0040-4020(96)01194-5
日期:1997.2
nucleophiles. The base-promoted reaction of ethyl 4-azido-2-diazo-3-oxo-butanoate with both acetaldehyde and benzaldehyde proceeded in high yield to produce mixed aldol products. The use of an equivalent amount of DABCO was found to be the best way to promote the reaction. The diastereoselectivity exhibited in the reaction is low and characteristic of condensations of α-substituted ketones with substituents
Rh-catalyzed intramolecular aromatic C–H insertion of α-diazo β-ketoesters: synthesis of 4-carbonyl chroman derivatives
作者:Xiaolin Zhang、Mei Lei、Yi-Nan Zhang、Li-Hong Hu
DOI:10.1016/j.tet.2014.03.093
日期:2014.5
A Rh-catalyzed intramoleculararomatic C–H insertion of α-diazo β-ketoesters was developed. This protocol offers a practical strategy for the synthesis of 4-carbonyl chroman derivatives with high yield and is compatible with a wide variety of substituents. Synthetic applications of the 4-carbonyl chroman were also demonstrated.