1.1: 90 percent / MnO2 2.1: 90 percent / polymer-supported BEMP / ethanol 3.1: NH3 4.1: dimethylformamide / 60 °C 4.2: polymer-supported HOBt; PyBrOP / dimethylformamide 4.3: isocyanate resin / tetrahydrofuran View Scheme

1.1: 90 percent / MnO2 2.1: 90 percent / polymer-supported BEMP / ethanol 3.1: NH3 4.1: dimethylformamide / 60 °C 4.2: polymer-supported HOBt; PyBrOP / dimethylformamide 4.3: isocyanate resin / tetrahydrofuran 5.1: 100 percent / NaOEt / ethanol / 0.17 h / 120 °C / microwave irradiation View Scheme

1: 90 percent / MnO2 2: 90 percent / polymer-supported BEMP / ethanol 3: NH3 View Scheme