General procedure for synthesis of compounds 1–7
To a 25 mL two-necked flask equipped with a magnetic stirrer was added 31a (0.5 mmol, l.0 equiv). The flask was then placed at -78 °C and 5 mL anhydrous THF was added under nitrogen….
To a 25 mL two-necked flask equipped with a magnetic stirrer was added 31a (0.5 mmol, l.0 equiv). The flask was then placed at -78 °C and 5 mL anhydrous THF was added under nitrogen….