Stereoselective Intra- and Intermolecular [2+2] Photocycloaddition Reactions of 4-(2′-Aminoethyl)quinolones
作者:Thorsten Bach、Sebastian Brandes、Philipp Selig
DOI:10.1055/s-2004-834817
日期:——
The 4-(2'-aminoethyl)quinolones 6, 8 and 9 were prepared starting from 4-(2'-bromoethyl)quinolone (4) in two steps and overall yields of 56-93%. They underwent inter- and intramolecular [2+2] photocycloaddition reactions with an alkene to provide the cyclobutanes 1-3 in racemic form (61-89% yield). The photochemical reaction proceeded with very good chemo-, regio- and stereoselectivity. It was in one
4-(2'-氨基乙基)喹诺酮6、8和9以4-(2'-溴乙基)喹诺酮(4)为原料,分两步制备,总产率为56-93%。他们与烯烃进行分子间和分子内 [2+2] 光环加成反应,以提供外消旋形式的环丁烷 1-3(产率 61-89%)。光化学反应以非常好的化学选择性、区域选择性和立体选择性进行。在一种情况下 (8b → 2b) 也进行了对映选择性 (93% ee)。