Efficient synthesis of azetidine through<i>N</i>-trityl- or<i>N</i>-dimethoxytritylazetidines starting from 3-amino-l-propanol or 3-halopropylamine hydrohalides
作者:Peter Huszthy、Jerald S. Bradshaw、Krzysztof E. Krakowiak、Tingmin Wang、N. Kent Dalley
DOI:10.1002/jhet.5570300506
日期:1993.10
acid giving the hydrogen perchlorate salt of azetidine. The latter compound was transformed into its free base using a strong base under anhydrous conditions. The relatively expensive 4,4′-dimethoxytrityl chloride and less expensive trityl chloride used in these synthetic procedures were recycled in good yields. Azetidine hydrogenperchlorate can be used to prepare N-substituted azetidines without the
据报道,从市售的3-氨基-1-丙醇或3-卤代丙胺氢卤化物开始制备氮杂环丁烷的有效合成路线。首先,制备合适的N-三苯甲基-或N-二甲氧基-三苯甲基保护的对甲苯氧基-或卤代丙胺。然后将这些前体环化成N-三苯甲基-或N-二甲氧基三苯甲基二氮杂环丁烷。该ñ在高氯酸存在下除去-保护基,得到氮杂环丁烷的高氯酸氢盐。在无水条件下,使用强碱将后一化合物转化为其游离碱。这些合成过程中使用的相对昂贵的4,4'-二甲氧基三苯甲基氯和较便宜的三苯甲基氯以高收率回收。氮杂环丁烷高氯酸氢盐可用于制备N-取代的氮杂环丁烷,而无需分离游离氮杂环丁烷。