2010
DOI: 10.1002/cjoc.201090072
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Efficient Synthesis of New Tetracyclic Benzofuro[3,2‐d]‐imidazo[1,2‐a]pyrimidine‐2,5‐(1H,3H)‐diones

Abstract: The aza-Wittig reaction of iminophosphorane (1) with aromaic isocyanates gave carbodiimides (2), which were allowed to react further with α-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.

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Cited by 5 publications
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