1: benzene / 15.5 h / Inert atmosphere; Reflux 2: sodium methylate / methanol / 20 °C / Inert atmosphere 3: water; 2-hydroxyethanethiol; magnesium chloride; β-galactosidase / 3 h / 37 °C / pH 7.2 / aq. phosphate buffer; Enzymatic reaction View Scheme

boron trifluoride diethyl etherate in ethanol; dichloromethane Ambient temperature;