The present invention relates to a process for the direct synthesis of a material with a CHA zeolite structure in the silicoaluminate form thereof containing copper atoms, which comprises at least the following steps: (i) Preparation of a mixture which contains at least one water source, one copper source, one polyamine, one source of Y tetravalent element, one source of X trivalent element, the tetraethylammonium cation as the only OSDA and one source of alkaline or alkaline earth (A) cations, and wherein the synthesis mixture has the following molar composition: YO2:aX2O3:bOSDA:cA:dH2O:eCu:fpolyamine (ii) Crystallization of the mixture obtained in (i) in a reactor; (iii) Recovery of the crystalline material obtained in (ii).