作者:Miroslava Čerňová、Radek Pohl、Michal Hocek
DOI:10.1002/ejoc.200900586
日期:2009.8
An interesting dichotomy in the regioselectivity and mechanism of direct C–H arylation of 1,3-dimethyluracil was observed. Its Pd-catalyzed reactions with diverse aryl halides in the absence of CuI lead preferentially to 5-aryluracils, while reactions in the presence of CuI give 6-aryl derivatives as the major products. Cu-mediated reactions (in the absence of a Pd catalyst) proceed with lower efficiency
观察到 1,3-二甲基尿嘧啶直接 C-H 芳基化的区域选择性和机制的有趣二分法。在不存在 CuI 的情况下,它与多种芳基卤化物的 Pd 催化反应优先导致 5-芳基尿嘧啶,而在 CuI 存在下的反应得到 6-芳基衍生物作为主要产物。Cu 介导的反应(在没有 Pd 催化剂的情况下)以较低的效率进行,但只产生 6-芳基尿嘧啶衍生物。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)