Copper(I)-Catalyzed Reductive Cross-Coupling of<i>N</i>-Tosylhydrazones with Amides: A Straightforward Method for the Construction of C(<i>sp</i><sup>3</sup>)N Amide Bonds from Aldehydes
作者:Peng Xu、Fu-She Han、Yan-Hua Wang
DOI:10.1002/adsc.201500331
日期:2015.11.16
A method for the one-pot synthesis of substituted amides from aldehydes and amides is presented. Namely, condensation of aldehydes with N-tosylhydrazide generated the N-tosylhydrazones which were then reductively cross-coupled in situ with primary or secondary amides in the presence of a copper catalyst to afford secondary or tertiary amides, respectively. The reaction proceeded efficiently for a wide
提出了一种由醛和酰胺一锅法合成取代酰胺的方法。即,醛与N-甲苯磺酰肼缩合产生N-甲苯磺酰肼,然后在铜催化剂存在下将其与伯或仲酰胺还原原位交联,分别得到仲或叔酰胺。在优化的条件下,反应可对多种醛和酰胺有效地进行,即10摩尔%的四(乙腈)铜(I)四氟硼酸酯[Cu(CH 3 CN)4 BF 4 ],1摩尔%的四氟硼酸酯。正丁基碘化铵[(n- Bu)4NI]和氢氧化钠[NaOH]在四氢呋喃(THF)中于80°C加热。结果,该方法提供了通过过渡金属催化的C(sp 3)N酰胺键形成反应由易得的醛合成取代酰胺的直接途径。