Buchwald-Hartwig Mono-N-arylation with 2,6-Dihaloisonicotinic Acid Derivatives: A Convenient Desymmetrization Method
作者:Margaret Brimble、Anna Lorimer、Patrick O’Connor
DOI:10.1055/s-2008-1067208
日期:2008.9
A method for the Buchwald-Hartwig mono-N-arylation of aniline with methyl 2,6-dichloroisonicotinate using Pd(OAc)2, XPhos, and t-BuONa is reported. Use of m-anisidine under the same conditions resulted in the amidation of the methyl ester. Mono-N-arylation of m-anisidine with 2,6-dichloro-N,N-diisopropylisonicotinamide and 2,6-dibromo-N,N-diisopropylisonicotinamide, however, was successfully achieved using Pd(OAc)2/XPhos/t-BuONa or Pd(OAc)2/(±)-BINAP/K2CO3, respectively. The present study demonstrates the sensitivity of this cross-coupling method to both the steric and electronic nature of the coupling partners.
报告了一种使用 Pd(OAc)2、XPhos 和 t-BuONa 将苯胺与 2,6-二氯异烟酸甲酯进行 Buchwald-Hartwig 单 N-芳香化反应的方法。在相同条件下使用间甲氧基苯胺可使甲酯发生酰胺化反应。然而,分别使用 Pd(OAc)2/XPhos/t-BuONa 或 Pd(OAc)2/(±)-BINAP/K2CO3 成功地实现了间甲氧基苯胺与 2,6-二氯-N,N-二异丙基异烟酰胺和 2,6-二溴-N,N-二异丙基异烟酰胺的单-N-芳香化反应。本研究证明了这种交叉偶联方法对偶联伙伴的立体和电子性质的敏感性。