导读
a) Conditions: 1a (0.25 mmol), Ir cat. (5.0 μmol), NaOtBu (11 μmol), EtOH (1.0 mL) at 75 °C. “t” was the time needed for the color change. The conversion and yields were determined by GC. b) No obvious color change. c) The conversion and yields in parentheses were obtained at 10 min. d) Color changed from tangerine to yellow. e) Color changed from brown to yellow. f) At RT. g) Without NaOtBu. h) tBuNH2 instead of NaOtBu.
