This invention relates to a selective acylation process for the preparation of phenolic N-disubstituted carbamate esters of steroids, comprising reacting in an inert solvent an acylating agent being a carbamoyl halogenide, a 4-(tertiary amino)-pyridine, or a complex thereof, optionally as a part of a polymer and a steroid having at least two free hydroxy groups, where at least one is phenolic and at least one is alcoholic, optionally in the presence of an acid acceptor.
本发明涉及一种制备类
固醇的
酚类 N-二取代
氨基甲酸酯的选择性酰化工艺,包括在惰性溶剂中使
氨基甲酰基卤化物、4-(叔
氨基)-
吡啶或其复合物的酰化剂(可选择作为聚合物的一部分)与具有至少两个游离羟基的类
固醇(其中至少一个是
酚基,至少一个是醇基)反应,可选择在有酸接受体存在的情况下进行。