作者:Gharpure, Santosh J.、Kalita, Deepika、Somani, Shipra、Pal, Juhi
DOI:10.1039/d4ob00855c
日期:——
Acid catalysed reductive etherification of N-propargyl amino alcohols for the stereoselective synthesis of cis-2,5/2,6-disubstituted morpholines and cis-2,6/2,7-disubstituted oxazepanes has been developed. Mechanistic studies revealed that terminal alkynols gave morpholines via a 6-exo-dig hydroalkoxylation–isomerization–reduction cascade. Interestingly, an alkyne hydration–cyclization–reduction sequence
开发了用于立体选择性合成顺式-2,5/2,6-二取代吗啉和顺式-2,6/2,7-二取代氧氮杂环庚烷的N-炔丙基氨基醇的酸催化还原醚化反应。机理研究表明,末端炔醇通过6- exo-dig加氢烷氧基化-异构化-还原级联产生吗啉。有趣的是,发现炔烃水合-环化-还原序列参与由烷基取代的内部炔醇形成氧氮杂环庚烷。该策略被用作杀菌剂十三吗啉和丁苯吗啉全合成的关键步骤。