Protecting group free, one-pot multicomponent Curtius reaction was utilized to afford diurethane G-1 dendron. In our synthetic approach, G-1 dendron can undergo late-stage modification using thiol-ene click reaction, which was then attached to the core to furnish a dendrimer. In another approach, the G-1 dendron was attached to the core and so formed dendrimer was surface functionalized using thiol-ene click chemistry. Either way, we can synthesize the dendrimer.
A Model for Late-Stage Modification of Polyurethane Dendrimers Using Thiol–Ene Click Chemistry