Synthesis of Pyrrole-Fused C,N-Cyclic Azomethine Imines and Pyrazolopyrrolopyrazines: Analysis of Their Aromaticity Using Nucleus-Independent Chemical Shifts Values


Ozer M. S. , Menges N. , Keskin S., ŞAHİN E., Balci M.

ORGANIC LETTERS, cilt.18, ss.408-411, 2016 (SCI İndekslerine Giren Dergi) identifier identifier identifier

  • Cilt numarası: 18 Konu: 3
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1021/acs.orglett.5b03434
  • Dergi Adı: ORGANIC LETTERS
  • Sayfa Sayıları: ss.408-411

Özet

The AgOTf-catalyzed reaction of C-2 substituted pyrrole hydrazones having an N-propargyl group was studied. The selective 6-endo-dig mode of cyclization was observed, giving rise to the formation of pyrrole-fused C,N-cyclic azomethine imine derivatives. The reaction of one azomethine imine derivative with various dipolarophiles resulted in the formation of cycloadducts having a pyrazolopyrrolopyrazine skeleton. The aromaticity of C,N-cyclic azomethine imines as well as that of pyrazolopyrrolopyrazines was determined by calculating of nucleus-independent chemical shifts values.