Chemoselectivity Control: Gold(I)-Catalyzed Synthesis of 6,7-Dihydrobenzofuran-4(5<i>H</i>)-ones and Benzofurans from 1-(Alkynyl)-7-oxabicyclo[4.1.0]heptan-2-ones
作者:Tao Wang、Shuai Shi、Mie Højer Vilhelmsen、Tuo Zhang、Matthias Rudolph、Frank Rominger、A. Stephen K. Hashmi
DOI:10.1002/chem.201301698
日期:2013.9.9
chemoselective gold(I)‐catalyzed transformations of 1‐(arylethynyl)‐7‐oxabicyclo[4.1.0]‐ heptan‐2‐ones were developed. Two completely different products—6,7‐dihydrobenzofuran‐4(5H)‐ones and benzofurans—could be obtained from the same starting material. The selectivity is determined by the ligand of the gold catalyst: triphenylphosphine delivers 6,7‐dihydrobenzofuran‐4(5H)‐ones, and 1,3‐bis(diisopro
开发了新的和化学选择性的金(I)催化的1-(芳基乙炔基)-7-氧杂双环[4.1.0]-庚烷-2-酮的转化。可以从同一原料中获得两种截然不同的产品-6,7-二氢苯并呋喃-4(5 H)-酮和苯并呋喃。选择性由金催化剂的配体决定:三苯基膦可提供6,7-二氢苯并呋喃-4(5 H)-酮,而1,3-双(二异丙基苯基)咪唑-2-亚烷基生成苯并呋喃。提供每种情况的11个示例。同位素标记实验为两种产品类型的机理提出了建议。