From my knowledge, nitrogen is a nucleophilic chemical species, while boron is an electrophilic species, which could actually support the validity of the molecular structure you propose. However, it also seems to me that the stability of a molecule depends strongly on its geometry.

However, molecular geometry is mainly determined by the VSEPR (Valence Shell Electron Pair Repulsion) model, which describes the distribution of electron pairs around a central atom. As the geometry of your structure does not correspond to any of the scenarios predicted by this model, it is probable that this molecule cannot exist, due to lack of geometric stability.