New iminophosphorane-mediated synthesis of thieno[3′,2′:4,5]thieno[3,2-d]pyrimidin-4(3H)-ones and 5H-2,3-dithia-5,7-diaza-cyclopenta[c,d]indenes
作者:Ming-Guo Liu、Yang-Gen Hu、Ming-Wu Ding
DOI:10.1016/j.tet.2008.07.036
日期:2008.9
reacted with aromatic isocyanates to give stable carbodiimides 8, which were further treated with aliphatic secondary or primary amines to give 2-amino substituted thieno[3′,2′:4,5]thieno[3,2-d]pyrimidin-4(3H)-ones 10 or 12 in the presence of a catalytic amounts of EtO−Na+. However, in the presence of a catalytic amounts of potassium carbonate, the carbodiimides 8 were transformed into previously unreported
由3,4-二氨基噻吩并[2,3- b ]噻吩3与过量的三苯基膦,C 2 Cl 6和Et 3 N的反应由于分子内双氢键的形成而选择性地制备了单(亚氨基膦烷)4。单(亚氨基磷烷)4与芳族异氰酸酯反应生成稳定的碳二亚胺8,将其进一步用脂肪族仲或伯胺处理,得到2-氨基取代的噻吩并[3',2':4,5]噻吩并[3,2- d催化量的EtO - Na存在下] pyrimidin-4(3 H)-ones 10或12+。然而,在催化量的碳酸钾存在下,碳二亚胺8通过直接环化以高收率转化成先前未报道的5 H -2,3-二硫-5,7-二氮杂-环戊烯[ c,d ]茚满13。碳二亚胺8与苯酚在催化量的碳酸钾存在下的反应得到2-芳氧基取代的噻吩并[3',2':4,5]噻吩并[3,2 - d ]嘧啶-4(3)的混合物H)-14和13。10m的X射线结构分析证明了氨基的结构和拟议的反应性。