We report a regiocontrolled 6-endo-dig cyclization of 2-(2-arylethynyl)heteroaryl esters occurred under Bronsted acidic conditions and in the presence of a catalytic amount of Lewis acids such as Cu(OTf)(2), AUCl(3), or (CF3CO2)Ag. A variety of heteroc yclic lactones are readily prepared in excellent yields. (C) 2007 Elsevier Ltd. All rights reserved.
Design, Synthesis, and Pharmacological Evaluation of <i>N</i>-Acylhydrazones and Novel Conformationally Constrained Compounds as Selective and Potent Orally Active Phosphodiesterase-4 Inhibitors
作者:Arthur E. Kümmerle、Martine Schmitt、Suzana V. S. Cardozo、Claire Lugnier、Pascal Villa、Alexandra B. Lopes、Nelilma C. Romeiro、Hélène Justiniano、Marco A. Martins、Carlos A. M. Fraga、Jean-Jacques Bourguignon、Eliezer J. Barreiro
DOI:10.1021/jm300514y
日期:2012.9.13
N-acylhydrazones (NAHs), the compound 8a was selected as a selective submicromolar phosphodiesterase-4 (PDE4) inhibitor associated with anti-TNF-α properties measured both in vitro and in vivo. The recognition pattern of compound 8a was elucidated through molecular modeling studies based on the knowledge of the 3D-structure of zardaverine, a PDE4 inhibitor resembling the structure of 8a, cocrystallized with