1: 98 percent / NaOH, cetyltrimetylammonium chloride / CH2Cl2 / 16 h 2: 87 percent / trifluoroacetic acid-anisole / 1 h 3: 100 percent / Phe, m-cresol, methanesulfonic acid, trifluoroacetic acid, thioanisole / 1 h / 0 °C / further acids, absence of thioanisole View Scheme