参考标题:Efficient Synthesis Of New Tetracyclic Benzofuro[3,2-D]-Imidazo[1,2-A]Pyrimidine-2,5-(1H,3H)-Diones 作者:Yanggen Hu,Min Liu,Mingwu Ding |发布日期:2010.2 摘要:With Aromaic Isocyanates Gave Carbodiimides (2), Which Were Allowed To React Further With (‐amino Ester In The Presence Of A Catalytic Amount Of Sodium Ethoxide To Give Selectively New Tetracyclic Benzofuro[3,2‐d]Imidazo[1,2‐a]Pyrimidine‐2,5‐(1H,3H)‐diones (5) In Good Yields. X‐ray Structure Analysis Of 5I Verified The Proposed Structure And The Reaction Selectivity.