
%0 Journal Article
%A Hudson, CB 
%A Robertson, AV 
%T The reactions of 3,4-dehydroproline with substituted isatins
%J Australian Journal of Chemistry
%D 1967/07/01
%V 20
%N 7
%P 1521-1531
%K 
%R https://doi.org/10.1071/CH9671521
%U https://www.publish.csiro.au/paper/CH9671521 
%X Substituted isatins having a free NH group react with 3,4- dehydroproline, like isatin itself, to give 3-(1-pyrrolyl)oxindoles. Analysis of the N.M.R. spectra of the 5-nitro and 5,7-dibromo analogues confirms that the isatins condense at their 3- and not their 2-carbonyl groups. N-Alkylisatins form similar products which, depending on the conditions, may react with a further molecule of the isatin to give unstable di-adducts whose structures have been determined. 
