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
Gold Catalysis: Isolation of Vinylgold Complexes Derived from Alkynes
作者:A. Stephen K. Hashmi、Andreas M. Schuster、Frank Rominger
DOI:10.1002/anie.200903134
日期:2009.10.19
Gold plated rings: N‐Propargylcarboxamides (1) when reacted with a goldcomplex containing the IPr N‐heterocyclic carbene ligand, delivers the first isolable vinylgold intermediates obtained fromalkynes. [see Scheme; IPr=1,3‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylide]