Unexpected rearrangement of intramolecular Diels-Alder adducts of citraconic anhydride and secondary furfuryl amines
作者:Rajappa Murali、Hans W. Scheeren
DOI:10.1016/s0040-4039(99)00316-0
日期:1999.4
The intramolecular Diels-Alder reactions of citraconic anhydride with several secondary furfuryl amines have been studied at different temperatures. At high temperatures, only a single cycloadduct was isolated, whilst at room temperature, a mixture of two regioisomeric adducts were formed. One of the regioisomers rearranged to another when heated in a solvent. Some aspects of the mechanism were investigated
Intra-molecular Diels–Alder reactions of citraconamic acids from furfurylamines and citraconic anhydride: effects of substitution in the furan ring on regioselectivity
作者:Rajappa Murali、H Surya Prakash Rao、Hans W Scheeren
DOI:10.1016/s0040-4020(01)00175-2
日期:2001.4
Regioselectivity in the intra-molecular Diels–Alder (IMDA) reaction of furfurylcitraconamic acids derived from N-benzylfurfurylamines and citraconic anhydride can be controlled by substituents located in the furan ring and by reaction conditions. Reactions conducted under kinetic conditions resulted in cycloaddition products having methyl and aminomethylene substituent in 1,3-relationship whereas under