The present invention involves an improved process for the preparation of Indocyanine green of Formula (I) having high purity of about 99%, wherein the process comprises steps of reacting 1,1,2-trimethyl-1H-benzo[e]indole with 1,4-butane sulfone in boiling solvent to give 4-(1,1,2-trimethyl-1H-benzo[e]indolium-3-yl)butane-1-sulfonate. Followed by reacting 4-(1,1,2-trimethyl-1H-benzo[e]indolium-3-yl)butane-1-sulfonate of Formula (IV) and N-phenyl-N-((1E,3E,5E)-5-(phenylimino)penta-1,3-dienyl)acetamide of formula (V) in presence of sodium acetate and alcohol; and extracting the title compound formula (I) with an ester solvent.
本发明涉及一种制备纯度高达约 99% 的式 (I) 靛青绿的改进工艺,其中该工艺包括以下步骤:1,1,2-三甲基-1H-苯并[e]
吲哚与 1,4-
丁烷砜在沸腾溶剂中反应,得到 4-(1,1,2-三甲基-1H-苯并[e]
吲哚鎓-3-基)
丁烷-1-
磺酸酯。然后将式(IV)的 4-(1,1,2-三甲基-1H-苯并[e]
吲哚鎓-3-基)
丁烷-1-
磺酸与式(V)的 N-苯基-N-((1E,3E,5E)-5-(苯基亚
氨基)戊-1,3-二基)乙酰胺在
乙酸钠和
乙醇存在下反应,并用
酯类溶剂萃取式(I)的标题化合物。