The first synthesis of 3-hydroxy-2-(polyfluoroalkyl)chromones and their ammonium salts. 3-hydroxychromone in the Mannich reaction
作者:Roman A. Irgashev、Vyacheslav Ya. Sosnovskikh、Anna A. Sokovnina、Gerd-Volker Röschenthaler
DOI:10.1002/jhet.386
日期:——
3‐Hydroxy‐2‐(polyfluoroalkyl)chromones were obtained in good yields via the nitrozation reaction of 2‐(polyfluoroalkyl)chroman‐4‐ones with isopropyl nitrite in the presence of hydrochloric acid. Treatment of 3‐acetoxy‐2‐(trifluoromethyl)chromone with primary amines and hydrazine gave the corresponding ammonium salts. Reaction of 3‐hydroxychromone, prepared by this method, with formaldehyde and α‐aminoacids