作者:Inga Inhülsen、Kerstin Schmidt、Paul Margaretha
DOI:10.1002/hlca.201000042
日期:——
3 and 4, whereas, under these conditions, 3‐(alk‐1‐ynyl)cyclohex‐2‐enones 5 give only one cyclobutane adduct 6 regio‐ and diastereoselectively. In contrast, 3‐(alk‐1‐ynyl)‐2‐methylcyclohex‐2‐enones 10 undergo [2+2]‐cycloaddition to the same diene exclusively at the C≡C bond to afford hitherto unknown 3‐cyclobutenylcyclohex‐2‐enones 11.
上照射,在2,3-二甲基丁-1,3-二烯的存在下,萘-2-酮1是定量和区域选择性转化成非对映异构环丁烷加合物的混合物3和4,而在这些条件下,3-(烷基-1-炔基)环己-2-烯酮5仅选择性地产生一个环丁烷和非对映体的环丁烷加合物6。相反,3-(alk-1-ynyl)-2-methylcyclohex-2-enones 10仅在C≡C键上与同一二烯进行[2 + 2]-环加成反应,从而提供迄今未知的3-cyclobutenylcyclohex-2-烯酮11。