corresponding N-oxides with acetic anhydride in a Polonovsky reaction and subsequent cleavage of the resulting acetamides by hydrochloric acid. Other demethylating reagents such as cyanogen bromide, vinyl chloroformate or trichloroethyl chloroformate caused an opening of the pyrrolidine unit of the investigated model compounds 8 – 10.
N-
甲基-6-
氨基-3-
氮杂双
环己烷衍
生物8、9和25可通过在Polonovsky反应中使相应的N-
氧化物与
乙酸酐反应并随后用
盐酸裂解所得乙
酰胺而
脱甲基。其他
脱甲基试剂,例如
溴化氰,
氯甲酸乙烯酯或
氯甲酸三
氯乙基
酯,导致了所研究的模型化合物8-10的
吡咯烷单元开口。