1.1: triethylamine tris(hydrogen fluoride) / tetrahydrofuran / 20 h / Inert atmosphere 2.1: N-(phenylthio)-ε-caprolactam; 2,4,6-tritert-butyl-pyridine / dichloromethane / 1 h / Inert atmosphere; Molecular sieve 2.2: 1 h / 10 °C / Inert atmosphere 3.1: tributylphosphine / 1,4-dioxane; chloroform; water / Inert atmosphere View Scheme