1: dicyclohexylcarbodiimide / pyridine / 72 h / Ambient temperature 2: 2 M NaOH / 2 h / Ambient temperature 3: H2 / Lindlar catalyst (poisoned) 4: pyridine / 4.5 h 5: pyridine / 24 h 6: 80percent aq. HOAc / 4.5 h 7: dicyclohexylcarbodiimide / pyridine / 72 h / Ambient temperature 8: 2 M NaOH / 2 h / Ambient temperature View Scheme

1: pyridine / 24 h 2: 0.16 g / 80percent aq. HOAc / 4.5 h 3: dicyclohexylcarbodiimide / pyridine / 72 h / Ambient temperature 4: 2 M NaOH / 2 h / Ambient temperature 5: H2 / Lindlar catalyst (poisoned) 6: pyridine / 4.5 h 7: pyridine / 24 h 8: 80percent aq. HOAc / 4.5 h 9: dicyclohexylcarbodiimide / pyridine / 72 h / Ambient temperature 10: 2 M NaOH / 2 h / Ambient temperature View Scheme

1: 0.16 g / 80percent aq. HOAc / 4.5 h 2: dicyclohexylcarbodiimide / pyridine / 72 h / Ambient temperature 3: 2 M NaOH / 2 h / Ambient temperature 4: H2 / Lindlar catalyst (poisoned) 5: pyridine / 4.5 h 6: pyridine / 24 h 7: 80percent aq. HOAc / 4.5 h 8: dicyclohexylcarbodiimide / pyridine / 72 h / Ambient temperature 9: 2 M NaOH / 2 h / Ambient temperature View Scheme

1: H2 / Lindlar catalyst (poisoned) 2: pyridine / 4.5 h 3: pyridine / 24 h 4: 80percent aq. HOAc / 4.5 h 5: dicyclohexylcarbodiimide / pyridine / 72 h / Ambient temperature 6: 2 M NaOH / 2 h / Ambient temperature View Scheme

1: pyridine / 4.5 h 2: pyridine / 24 h 3: 80percent aq. HOAc / 4.5 h 4: dicyclohexylcarbodiimide / pyridine / 72 h / Ambient temperature 5: 2 M NaOH / 2 h / Ambient temperature View Scheme