PROCESS FOR THE CYCLOADDITION OF A(HETERO)ARYL 1,3-DIPOLE COMPOUND WITH A (HETERO)CYCLOALKYNE

The present invention relates to a process comprising the step of reacting a (hetero)aryl 1,3-dipole compound with a (hetero)cycloalkyne, wherein:a (hetero)aryl 1,3-dipole compound is defined as a compound comprising a 1,3-dipole functional group, wherein the 1,3-dipole functional group is bonded to a (hetero)aryl group, and wherein the (hetero)aryl 1,3-dipole compound is a (hetero)aryl azide or a (hetero)aryl diazo compound;wherein:(i) the (hetero)aryl group of the (hetero)aryl 1,3-dipole compound comprises one or more substituents having a positive value for the para-Hammett substituent constant σp and/or the meta-Hammett substituent constant σm, and/or(ii) the (hetero)aryl group of the (hetero)aryl 1,3-dipole compound is an electron-poor (hetero)aryl group, wherein an electron-poor (hetero)aryl group is:(ii-a) a (hetero)aryl group wherein the (hetero)aromatic ring system is bearing a positive charge, and/or(ii-b) a (hetero)aryl group wherein the ratio {number of π-electrons present in the (hetero)aromatic ring system} : {number of protons present in the nuclei of the (hetero)aromatic ring system} is lower than 0.167 for a 6-membered ring, or lower than 0.200 for a 5-membered ring;and wherein the (hetero)cycloalkyne is a (hetero)cyclooctyne or a (hetero)cyclononyne according to Formula (1):The invention also relates to the products obtainable by the process according to the invention.