3 (3 g, 15 mmol) is dissolved in 150 ml of propionitril. Ethyldiisopropylamine (10.2 ml, 60 mmol), (−)-lupinine (2.5 g, 15 mmol) and cyanomethyl-trimethyl-phosphonium iodide (Zaragoza reagent, 7.3 g, 30 mmol) are added. The reaction mixture is heated to 120° C. and stirred for 22 hours. Then the mixture is evaporated under reduced pressure. The residue is dissolved with ethyl acetate, washed 10% K2CO3- and NaCl-solution, and dried over Na2SO4. Evaporation gave 5.7 g of a brown oil. The crude product is purified by Flash-chromatography (ethyl acetate, then methanol/ethyl acetate (4:6), silicagel).
