An easy route to lithium N,N-bis(trimethylsilyl)aminomethylacetylide 1 is described. Reactions of 1 with electrophiles give rise to various protected primaryamines.
The readily obtained N,N-bis(trimethylsilyl)-propargylic amines are shown to be useful precursors of various functional protectedprimaryamines. It readily gives rise to N,N-bis(trimethylsilyl)dienamines, 2-aza-1,3,5-hexatrienes, α-allenic amines, substituted allylamines and lactams.
The reactions of lithium N,N-bis(trimethylsilyl)aminomethyl acetylide with electrophilicreagents offered a short preparation of substituted and functional propargyl amines. These are shown to be useful precursors of various unsaturated protected primary amines. Addition reactions to the carboncarbon triple bond or isomerisation reactions gave rise to allylic, dienic and α-allenic amines.
Gold-Catalyzed Cyclization of Nonterminal Propargylic Amides to Substituted Alkylideneoxazolines and -oxazines
作者:A. Stephen K. Hashmi、Andreas M. Schuster、Martin Schmuck、Frank Rominger
DOI:10.1002/ejoc.201100342
日期:2011.8
The substrate scope of the gold-catalyzedcyclization of nonterminal propargylic amides to oxazolines and oxazines was investigated. Sixteen alkyl-substituted and 35 aryl-substited substrates were prepared by a very variable route from trimethylsilyl-(TMS-)protected, nonterminal propargylamines. Steric and electronic influences of the substituents on product selectivity were studied. A chloromethyl