To a flame-dried 5-mL microwave vial equipped with a magnetic stir bar was added ketone 11-5 (15 mg, 0.076 mmol, 1.0 equiv), N,N-dimethylmethyleneiminium chloride (8 mg, 0.084 mmol, 1.1 equiv) and MeCN (0.15 mL, 0.5 M). The reaction vessel was sealed with a Teflon-coated silicon microwave cap and moved to a 70 °C preheated oil-bath. After stirring at 70 °C for one hour, the reaction vessel was removed from the oil bath and allowed to cool to room temperature. Once at room temperature the reaction mixture was concentrated under reduced pressure by rotary evaporation to give 11-7 as a yellow oil (12 mg), which was used without further purification.