3-Methoxalylchromone - A Versatile Reagent for the Regioselective Synthesis of 1-Desazapurine - Ostrovskyi, Dmytro; Iaroshenko, Viktor O.; Ali, Iftikhar; Mkrtchyan, Satenik; Villinger, Alexander; Tolmachev, Andrei; Langer, Peter (Synthesis, 2011)