Citation:
Yu Lu Chen, Yi Bo Nie, Ming Wu Ding. Efficient synthesis of 5,6-dihydrothieno[3',2':4,5] thieno[2,3-d]pyrimidin-4(3H)-ones via an iminophosphorane[J]. Chinese Chemical Letters,
;2009, 20(9): 1055-1058.
doi:
10.1016/j.cclet.2009.04.004
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5,6-Dihydrothieno[3',2':4,5]thieno[2,3-d]pyrimidin-4(3H)-ones 6 were synthesized in yields of 71-87% by a consecutive method, which includes aza-Wittig reaction of iminophosphorane 3 with aromatic isocynate to give carbodiimide 4 and subsequent reaction of 4 with various amines, phenols or alcohols in the presence of catalytic amount of sodium ethoxide or solid potassium carbonate.
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