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■ 15N NMR Spectroscopy of Annulated Δ2-Pyrazolines and Δ2-1,2,4-Triazolines

Teresa Recca, Lara De Benassuti, and Giorgio Molteni*

*Department of Organic and Industrial Chemistry, University of Milano, Via Golgi 19, 20133 Milano, Italy

Abstract

Enantiopure Δ2-pyrazolines and Δ2-1,2,4-triazolines fused to the 1,4-benzodiazepine moiety, as well as Δ2-pyrazolines annulated to the 1,5-benzoxazocine moiety (racemic) or inserted in a bis-1,3-pyrazolophane skeleton (enantiopure) were investigated through 15N NMR spectroscopy in natural abundance. Nitrogen chemical shifts were determined by (1D)-INEPT experiments, while proton-nitrogen scalar coupling were obtained through 2D-J-HMBC experiments