A two step regioselective synthesis of 2,4-disubstituted imidazoles based on the reaction of α-azidoacetyl indoles with carboxylic acids in the presence of tertiary phosphines followed by cyclization of the resulting ketoamides by the action of ammonium acetate under microwave irradiation is described. The method has successfully been applied to the synthesis of the antifungal nortopsentin D [2,4-bis(3-indolyl)imidazole].
基于α-
叠氮乙酰基
吲哚与
羧酸在三苯膦存在下的反应,随后通过
乙酸铵在微波照射下引发的酮酰胺环化,描述了一种2,4-二取代
咪唑的区域选择性两步合成方法。该方法已成功应用于抗真菌药物nortopsentin D [2,4-双(3-
吲哚基)
咪唑]的合成。