Substituent effects on the regioselectivity of maleamic acid formation and hydrogen chloride addition to N-aryl maleimides

Faturaci Y., Coskun N.

TURKISH JOURNAL OF CHEMISTRY, cilt.36, sa.5, ss.749-758, 2012 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 36 Sayı: 5
  • Basım Tarihi: 2012
  • Doi Numarası: 10.3906/kim-1203-34
  • Dergi Adı: TURKISH JOURNAL OF CHEMISTRY
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.749-758
  • Anahtar Kelimeler: Cyclic anhydrides, maleimides, chlorosuccinimides, LFERs, substituent effect, ALPHA-CHLOROSUCCINIMIDES, EFFICIENT SYNTHESIS, MALEANILIC ACIDS
  • Bursa Uludağ Üniversitesi Adresli: Evet

Özet

Itaconic anhydride reacts with aryl amines to give a substituent controlled equilibrium mixture of regioisomeric (Z)-2-methyl-and (Z)-3-methyl-4-oxo-4-(arylamino) but-2-enoic acids. Electron-donating groups favor nucleophilic attack on C-5 carbonyl, while the presence of electron-withdrawing groups enhances the bias for attack on C-2 carbonyl. The treatment of (Z)-2-methyl-and (Z)-3-methyl-4-oxo-4-(arylamino) but-2enoic acids with SOCl2-Et3N in THF provided the corresponding maleimides in high yields while under the same conditions the maleic anhydride aryl amine addition products gave predominately the corresponding 3-chloro-1-arylpyrrolidine-2,5-diones and maleimides in substituent dependent ratio.