Synthesis of esters as an important intermediate from carboxylic acids or aldehydes is one of the popular transformations in organic chemistry [1]. Traditionally base/acid homogeneous catalysts were applied for the direct esterification of carboxylic acids. In the recent years, heterogeneous catalysts had also been reported which most of these catalytic systems are present acidic nature. Metal oxides such as Al2O3, Fe3O4, SnO, ZnO, CaO, ZnO–La2O3, sulfated zirconia, and sulfated carbon were used for catalytic synthesis of esters from carboxylic acids and alcohols. In the last years, carbon with attractive properties such as porous structure, excellent electrical conductivity, and high stability find widespread applications as support in catalysts [2]. It is well known that structural modifications on the surface of carbon can effectively change the nature of the catalysts. Heteroatom doping strategy can control the intrinsic reactivity of the active metallic sites [3]. Among different dopants, nitrogen is the most intensively investigated. In this paper, we have prepared highly monodispersed, nitrogen-doped porous carbon nanospheres as a solid ligand for generation of Cu nanoparticles for esterification of various aryl aldehydes with primary, secondary and tertiary alcohols -Fig. 1-. Generally, nitrogen doping provides basic properties, which can enhance the interaction between substrates and carbon surfaces. Also, nitrogen doping was able to increase the hydrophilicity of catalyst which led to the high dispersion ability of catalytic system in aqueous media. Fig. 1 Cu@N-doped Cs catalyzed esterification reaction of various carboxylic acids with alcohols References [1] J. Otera, Wiley-VCH, Weinheim, 2003. [2] H. Marsh, and F. R. Reinoso, Activated Carbon, 1st Edition, 2006. [3] K.N. Wood, R. O\\\'Hayre, S. Pylypenko, Energy & Environmental Science, 2014, 7:1212-1249.

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