Manganese(III)-Mediated Oxidative Radical Cyclization 3. Synthesis of 3-Azabicyclo[3.3.0]-octan-2-ones and Related Compounds in the Reaction of 1,1,6,6-Tetraarylhexa-1,5-dienes with N,N’-Disubstituted Malonamides
作者:Hiroshi Nishino、Kiyotaka Ishida、Hideaki Hashimoto、Kazu Kurosawa
DOI:10.1055/s-1996-4310
日期:1996.7
The oxidation of 1,1,6,6-tetraarylhexa-1,5-dienes with manganese(III) acetate in the presence of N,N’-diarylmalonamides gave 1-(arylcarbamoyl)-8-(diarylmethylene)-3,4,4-triaryl-3-azabicyclo[3.3.0]octan-2-ones and 4,4,9,9-tetraaryl-2,11-bis(arlyimino)-3,10-dioxatricyclo[6.3.0.01,5]undecanes in good to moderate yields together with 11-(arylimino)-3,4,4,9,9-pentaaryl-10-oxa-3-azatricyclo[6.3.0.01,5]undecan-2-ones. A similar reaction in the presence of N,N’-dimethylmalonamide also yielded 3-azabicyclo[3.3.0]octan-2-one derivatives. An acid-catalyzed decomposition of the tricyclic diimines in acetic acid caused ring opening, while a similar decomposition in anhydrous THF resulted in recyclization at the nitrogen atom and/or hydrolysis of one of the imine bonds. A modification for the synthesis of 3-azabicyclo[3.3.0]octan-2-ones is discussed according to the results of the acid-catalyzed decomposition of the tricyclic imines.
在 N,N'-二芳基丙二酰胺存在下,用乙酸锰 (III) 氧化 1,1,6,6-四芳基六-1,5-二烯,得到 1-(芳基氨基甲酰基)-8-(二芳基亚甲基)-3,4 ,4-三芳基-3-氮杂双环[3.3.0]辛烷-2-酮和4,4,9,9-四芳基-2,11-双(芳基亚氨基)-3,10-二氧三环[6.3.0.01,5]十一烷与 11-(芳基亚氨基)-3,4,4,9,9-五芳基-10-氧杂-3-氮杂三环[6.3.0.01,5]十一烷-2-酮一起产率良好至中等。在 N,N'-二甲基丙二酰胺存在下的类似反应也产生了 3-氮杂双环[3.3.0]辛烷-2-酮衍生物。三环二亚胺在乙酸中的酸催化分解导致开环,而无水THF中的类似分解导致氮原子再环化和/或亚胺键之一水解。根据三环亚胺的酸催化分解结果,讨论了3-氮杂双环[3.3.0]辛烷-2-酮合成的改进。