A Synthesis of 1-Azaanthraquinones via Diels-Alder Reaction of 4-Hydroxy- and 4-Methoxy-2-phenylquinolinequinones with 3-Trimethylsilyloxy-1,3-butadienes: Observation of Inverse Regioselectivity.
作者:Yoshie HORIGUCHI、Akio TOEDA、Katuhiro TOMODA、Hideki SUZUKI、Takehiro SANO
DOI:10.1248/cpb.46.1356
日期:——
Diels-Alder reaction of 4-hydroxy-2-phenylquinolinequinone (10a) and 4-methoxy-2-phenylquinoline-quinone (10b) with 1-methoxy-3-trimethylsilyloxybutadiene proceeded in a highly regio- and stereoselective manner to give the [4+2] adducts (11) and (14) in good yields, respectively. The structures of the adducts and their derivatives were unambiguously determined by spectroscopic data, including high resolution heteronuclear multi bond correlation. The quinolinequinones (10a and 10b) gave inverse regioselectivity. This is related to the presence of the hydroxy group or the methoxy group at the C-4 position. These results demonstrated that Diels-Alder reaction of azadienophiles with activated dienes provides a versatile method for synthesizing 4-oxygenated 1-azaanthraquinones.
4-hydroxy-2-phenylquinolinequinone (10a) 和 4-methoxy-2-phenylquinoline-quinone (10b) 与 1-methoxy-3-trimethylsilyloxybutadiene 的 Diels-Alder 反应以高度区域和立体选择性的方式进行,分别以良好的产率得到 [4+2] 加合物 (11) 和 (14)。这些加合物及其衍生物的结构通过光谱数据(包括高分辨率异核多键相关性)得以明确确定。喹啉醌(10a 和 10b)具有反区域选择性。这与 C-4 位置存在羟基或甲氧基有关。这些结果表明,氮二烯化合物与活化二烯的 Diels-Alder 反应为合成 4 氧代 1-azaanthraquinones 提供了一种通用方法。