Indium‐Catalysed Transfer Hydrogenation for the Reductive Cyclisation of 2‐Alkynyl Enones towards Trisubstituted Furans
作者:Luomo Li、Sascha Kail、Sebastian M. Weber、Gerhard Hilt
DOI:10.1002/anie.202109266
日期:2021.10.25
Indiumtribromidecatalysed the transferhydrogenation from dihydroaromatic compounds, such as the commercially available γ-terpinene, to enones, which resulted in the cyclisation to trisubstituted furan derivatives. The reaction was initiated by a Michael addition of a hydride nucleophile to the enone subunit followed by a Lewis-acid-assisted cyclisation and the formation of a furan–indium intermediate
三溴化铟催化从二氢芳香族化合物(例如市售的γ-萜品烯)到烯酮的转移氢化,从而环化为三取代的呋喃衍生物。该反应是通过将氢化物亲核试剂迈克尔加成到烯酮亚基上引发的,然后进行路易斯酸辅助环化并形成呋喃-铟中间体和衍生自二氢芳族起始材料的Wheland中间体。该产物是通过 Wheland 配合物质子化形成的,并取代了三溴化铟取代基。此外,二氢芳香族 HD 替代物的位点特异性氘标记导致了产物的位点特异性标记,并通过 H-D 加扰提供了对反应机制的有用见解。