A convenient synthesis of 3,4-diaryl(hetaryl)-substituted maleimides and maleic anhydrides
摘要:
A convenient procedure has been developed for the synthesis of 3,4-diaryl(or hetaryl)maleimides by cross coupling of N-substituted 3,4-dibromomaleimides with aryl(hetaryl)boronic acids in the presence of Pd(Ph3P)(4) and CsF The reaction ensures high yields of the products and requires relatively small amount of the catalyst; it can be performed on an enlarged scale. The resulting maleimides are readily converted into the corresponding maleic anhydrides.
3a,7a-Dibromo-2-butyl-4,7-methano-1,3,3a,4,7,7a-hexahydro-2H-isoindole-1,3-dione from the Reaction of 3,4-Dibromo-1-butylmaleimide with Cyclopentadiene
摘要:
It is shown that reaction of 1-butylpyrrole successively with N-bromosuccinimide then nitric acid gives 3,4-dibromo-1-butylmaleimide since the latter then undergoes Diels-Alder cycloaddition with cyclopentadiene to give the title compound, C13H15Br2NO2.
作者:W. Chen、J.-X. Yang、Z.-P. Bai、Z.-X. Wang、X.-Z. You
DOI:10.1107/s0108270197000024
日期:1997.5.15
The X-ray structure analysis of the title compound, C8H9Br2NO2, was carried out. In the unit cell, the molecules are stacked with their C=C double bonds at close intermolecular distances of approximately 3.6 Angstrom. Conjugation in the imide ring is not significant.