Barbituric Acid Initiated Rearrangement of 2,2‘-Pyridil into 5,5‘-(2-pyrilidine)bisbarbituric Acid
作者:Branko S. Jursic、Donna M. Neumann、Kenneth L. Martin、Edwin D. Stevens
DOI:10.1021/ol017305i
日期:2002.3.1
[GRAPHICS]In the study of the barbituric acid initiated 2,2'-pyridil rearrangement, a very efficient synthetic procedure (isolated yield 80-90%) for the preparation of useful 2-pyrilidenes 3 was developed.
作者:Branko S. Jursic、Donna M. Neumann、Zakhia Moore、Edwin D. Stevens
DOI:10.1021/jo0161431
日期:2002.4.1
A synthetic procedure for the preparation of the unusual charge-separated pyridinium barbiturate zwitterion 2 from 1,3-dimethylbarbituric acid and 2-pyridinecarbaldehyde in methanol was developed. The structure of the compound was confirmed with X-ray analysis to demonstrate the strong charge separation throughout the molecule. One would expect that this charge separation would increase its reactivity; however, contrary to this expectation, the compound is very stable in acidic media, and in the presence of a base, decarbonylation occurs on one barbituric acid while the zwitterionic moiety of the molecule stays intact.