Ligand-Controlled Product Selectivity in Gold-Catalyzed Double Cycloisomerization of 1,11-Dien-3,9-Diyne Benzoates
作者:Weidong Rao、Dewi Susanti、Benjamin James Ayers、Philip Wai Hong Chan
DOI:10.1021/jacs.5b02377
日期:2015.5.20
bridged heptenones and hexenones from gold(I)-catalyzed double cycloisomerization of 1,11-dien-3,9-diyne benzoates is described. A divergence in product selectivity was achieved by fine-tuning the steric nature of the ligand of the Au(I) catalyst. In the presence of [MeCNAu(JohnPhos)](+)SbF6(-) (JohnPhos = (1,1'-biphenyl-2-yl)-di-tert-butylphosphine) as the catalyst, tandem 1,3-acyloxy migration/metallo-Nazarov
描述了一种从金 (I) 催化双环异构化 1,11-二烯-3,9-二炔苯甲酸酯制备三环桥连庚烯酮和己烯酮的合成方法。通过微调 Au(I) 催化剂配体的空间性质,实现了产品选择性的差异。在[MeCNAu(JohnPhos)](+)SbF6(-)(JohnPhos = (1,1'-biphenyl-2-yl)-di-tert-butylphosphine)作为催化剂存在下,串联1,3-酰氧基迁移/金属-纳扎罗夫环化/1,6-烯炔加成/底物的Cope重排被发现选择性地发生以提供桥连庚烯酮加合物。相反,将 Au(I) 催化剂改为 [MeCNAu(Me4tBuXPhos)](+)SbF6(-) (Me4tBuXPhos = di-tert-butyl(2',4',6'-triisopropyl-3,4,5,观察到 6-四甲基-[1,1'-联苯]-2-基)膦)产生 1,11-dien-3,