Synthesis and Mechanistic Study of Cyclic Oxoguanidines via Zn(OTf)<sub>2</sub>-Catalyzed Guanylation/Amidation from Readily Available Amino Acid Esters and Carbodiimides
作者:Yue Chi、Ling Xu、Shanshan Du、Haihan Yan、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1002/chem.201500573
日期:2015.7.13
The Zn(OTf)2‐catalyzed guanylation/amidationfromreadilyavailableaminoacidesters and carbodiimides is achieved to provide efficiently various cyclicoxoguanidines, including 2‐amino‐1H‐imidazol‐5(4H)‐ones and 2‐aminoquinazolin‐4(3H)‐ones in medium‐to‐high yields. It is the first time that an ammonium salt has been used in a guanylation reaction. The application of cyclicoxoguanidines to provide
regioselective syntheses of a wide range of linearly and angularly fused benzoimidazoquinazolinones. The selectivity of the products relies on the generation of either highly electrophilic oxyphosphonium or less reactive imidate intermediates. A direct amine attack at the C-2 position of the oxyphosphonium intermediate presumably drives the reaction toward the linearly fused products, whereas an attack of
conditions. Triphenylbismuth dichloride promoted the conversion of thioxoquinazolinone to tetracyclic products as an efficient cyclodesulfurization reagent. All the steps in this tandemreaction were performed at room temperature. The present reaction system can also be applied to benzoxazoloquinazolinone synthesis by using 2-aminophenols as the starting material.
The present invention relates to an electronic device comprising anode, cathode and at least one organic layer which comprises a compound of the formula (I) to (IV). The invention furthermore encompasses the use of compounds of the formula (I) to (IV) in an electronic device and to a compound of the formula (Ic) to (IVc).