Synthesis of 5-Azaindolizine Derivatives by the Palladium-Catalyzed Intermolecular Formal [3+2] Cycloaddition of Alkylidenecyclopropanes with 1,2-Diazines
作者:Amal I. Siriwardana、Itaru Nakamura、Yoshinori Yamamoto
DOI:10.1021/jo035810i
日期:2004.4.1
The palladium-catalyzed formal [3+2] cycloaddition reaction of alkylidenecyclopropanes with 1,2-diazines proceeded smoothly to give the corresponding 5-azaindolizine derivatives in good to allowable yields. For example, in the presence of 5 mol % of Pd(PPh3)4, the reaction of 1-propylhexylidenecyclopropane with phthalazine or with pyridazine proceeded at 120 °C without solvent, and the corresponding
亚烷基亚环丙烷与1,2-二嗪的钯催化的正式[3 + 2]环加成反应进展顺利,以允许的收率好得到相应的5-氮杂吲哚嗪衍生物。例如,在5 mol%的Pd(PPh 3)4存在下,1-丙基亚己基环丙烷与酞嗪或哒嗪的反应在没有溶剂的情况下于120°C进行,相应的2-(1-丁基戊基)吡咯并[2] ,1-一个]酞嗪或6-(1-丁基戊基)吡咯并[1,2- b在61%或49%的收率分别获得]哒嗪。