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Reaction conditions: Step A: pyridinium salts (0.2 mmol), piperidine (2.5 equivalents), H2O (1.0 mL), and 80 °C. Step B: ylides (1.5 equivalents based on the products of step A), TMG (1.0 equivalent), toluene (1.0 mL), and 110 °C. The d.r. value was determined by 1H NMR.
The yields of step A.
The yields of step B.
