Access to 2-(Het)aryl and 2-Styryl Benzoxazoles via Palladium-Catalyzed Aminocarbonylation of Aryl and Vinyl Bromides
作者:Karoline T. Neumann、Anders T. Lindhardt、Benny Bang-Andersen、Troels Skrydstrup
DOI:10.1021/acs.orglett.5b00642
日期:2015.5.1
procedure for the synthesis of either 2-(hetero)aryl or 2-styryl benzoxazoles is reported, starting from aryl and vinyl bromides, respectively, involving an initial aminocarbonylation with 2-aminophenols as nucleophiles followed by an acid mediated ring closure to generate the heterocycle. The methodology displays a broad substrate scope in moderate to excellent yields and can be exploited for 13C-isotope
报道了一种顺序一锅法合成2-(杂)芳基或2-苯乙烯基苯并恶唑的方法,该方法分别从芳基和乙烯基溴开始,涉及以2-氨基酚为亲核试剂的初始氨基羰基化反应,然后是酸介导的环闭合以生成杂环。该方法显示了中等范围到优异产量的广泛底物范围,可用于13 C同位素标记。最后,将此羰基化方案应用于潜在的阿尔茨海默氏菌斑粘合剂和选择性PPAR拮抗剂的合成,包括用13 C-一氧化碳进行位点特异性标记。