(-)-N1-Benzylnorphysostigmine (4), prepared from synthetic (-)-O-methyl-N1-noreseroline (1) by N-benzylation, ether cleavage, and reaction of (-)-N1-benzylnoreseroline (3) with methyl isocyanate, was the intermediate used to prepare the title compounds. Catalytic debenzylation of 4 afforded (-)-N1-norphysostigmine (5), and (-)-eseramine (6) was obtained by reaction of 5 with methyl isocyanate. Reductive
(-)-N1-苄基正
卟啉(4),由合成(-)-O-甲基-N1-正甾烷(1)通过N-苄基化,醚裂解和(-)-N1-苄基正甾烷(3)与
异氰酸甲酯是用于制备标题化合物的中间体。4与5的
异氰酸甲酯反应,得到4的催化脱苄基作用,得到(-)-N1-norphysostigmine(5)和(-)-eseramine(6)。5的还原性N-甲基化得到(-)-
毒扁豆碱(9),而5与烯丙基
溴和苯乙基
溴的反应分别得到
氨基甲酸酯7和8。据报道有关这些化合物作为电鳗
乙酰胆碱酯酶抑制剂的体外效力(IC50)和活性的数据。发现(-)-N1-Norphysostigmine(5)与(-)-physostigmine(9)类似,对AChE的功效也很强。